├── .gitignore ├── requirements.txt ├── Dockerfile ├── settings_example.yaml ├── README.md ├── cyripto_trader.py └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | *.pyc 2 | *.pyo 3 | *.tar.gz 4 | *.tar.bz2 5 | settings.py 6 | settings.yaml 7 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | DateTime==4.2 2 | poloniex==0.0.10 3 | requests==2.20.0 4 | urllib3==1.26.5 5 | pyyaml>=5.4 6 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | # Use an official Python runtime as a parent image 2 | FROM python:2.7-slim 3 | 4 | # Set the working directory to /app 5 | WORKDIR /app 6 | 7 | # Copy the current directory contents into the container at /app 8 | ADD . /app 9 | 10 | # Install any needed packages specified in requirements.txt 11 | RUN pip install -r requirements.txt 12 | 13 | RUN python --version 14 | 15 | # Run cyripto_trader.py when the container launches 16 | CMD ["python", "cyripto_trader.py"] -------------------------------------------------------------------------------- /settings_example.yaml: -------------------------------------------------------------------------------- 1 | # rename this file to settings.yaml and enter the api keys for poloniex 2 | polo_api: 3 | key: super_rich_acounts_api_key 4 | secret: super_secret_top_secret 5 | 6 | 7 | # set my coin data 8 | coin: 9 | currency: BTC 10 | my_coin: ZEC 11 | 12 | # dust definitions 13 | # Those variables should be adjusted for the coin. They may change as the volume and value of the coin changes. 14 | 15 | # This is total BTC amount of the orders in the orderbook 16 | dust_total: 5.5 17 | 18 | # this is the order amount in coins to accept not dust 19 | dust_amount: 50.0 20 | 21 | # the spread that we like to trade 22 | min_spread: 0.0002 23 | 24 | # How much coin we may trade? 25 | max_trading_amount: 3 26 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # cyrpto_trader 2 | This project is moved to gitlab. 3 | 4 | https://gitlab.com/timucin/cyrpto_trader 5 | 6 | 7 | Trading automation on poloniex cryptocoin exchange 8 | 9 | Using poloniex api python library from https://github.com/Aula13/poloniex 10 | 11 | 12 | To install dependencies use python pip command 13 | 14 | ``` 15 | pip install -r requiremenets.txt 16 | ``` 17 | 18 | # Usage 19 | 20 | To sell coins use this: 21 | 22 | ``` 23 | python cyripto_trader.py sell_all 24 | ``` 25 | 26 | To buy coins with all your BTC balance use this: 27 | 28 | ``` 29 | python cyripto_trader.py buy_all 30 | ``` 31 | 32 | To use the basic ping-pong scalping strategy (highly risky!): 33 | 34 | ``` 35 | python cyripto_trader.py scalp 36 | ``` 37 | 38 | _**Disclaimer:** This is highly experimental software. Use it at your own risk._ 39 | _This may make you lose all you money, scare your cat and make your dog piss on the carpet._ 40 | 41 | # Docker instructions 42 | 43 | No previous installation (`python` or whatsoever) is required other than `docker`. 44 | 45 | Build the docker image (once): 46 | 47 | ``` 48 | docker build -t crypto_traders . 49 | ``` 50 | 51 | Run the image 52 | ``` 53 | docker run crypto_traders 54 | ``` 55 | 56 | # Donation 57 | 58 | You can send me some small amount of BTC if you like. 59 | I may use it to test this better or I'll buy some beers. :) 60 | 61 | **BTC :** 1JRGwEkSbpGXs3Csub46PVAQwReo4gcjq2 62 | -------------------------------------------------------------------------------- /cyripto_trader.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | # -*- coding: utf-8 -*- 3 | import decimal 4 | import datetime 5 | import time 6 | 7 | import argparse 8 | 9 | from poloniex import Poloniex 10 | 11 | # api keys are in the settings.yaml 12 | try: 13 | import yaml 14 | with open('settings.yaml') as f: 15 | settings = yaml.safe_load(f) 16 | if not (settings and 17 | settings.get('polo_api', None) and 18 | settings['polo_api'].get('key', None) and 19 | settings['polo_api'].get('secret', None)): 20 | raise ValueError('api keys missing') 21 | 22 | except (ValueError, IOError): 23 | print "settings not found." 24 | print "create a file named settings.yaml and put them here like this:" 25 | print "polo_api:" 26 | print " key: super_rich_acounts_api_key" 27 | print " secret: super_secret_top_secret" 28 | print "" 29 | exit() 30 | 31 | class Trader(object): 32 | """Trader class 33 | """ 34 | def __init__(self, api_key, api_secret, coin, currency, dust_total=10, 35 | dust_amount=100.0, min_spread=0.0001, max_trading_amount=1): 36 | # set currency pair 37 | self.coin = coin 38 | self.currency = currency 39 | self.my_pair = '%s_%s' % (currency, coin) 40 | 41 | # we'll need this while finding buy/sell prices 42 | self.dust_total = self.make_satoshi(dust_total) 43 | self.dust_amount = self.make_satoshi(dust_amount) 44 | self.min_spread = self.make_satoshi(min_spread) 45 | self.max_trading_amount = self.make_satoshi(max_trading_amount) 46 | 47 | # initialize the poloniex api 48 | self.api_key = api_key 49 | self.api_secret = api_secret 50 | self.polo = Poloniex(api_key, api_secret) 51 | 52 | # initialize other variables 53 | self.coin_balance = self.make_satoshi('0.0') 54 | self.currency_balance = self.make_satoshi('0.0') 55 | self.total_coin_balance = self.make_satoshi('0.0') 56 | self.total_currency_balance = self.make_satoshi('0.0') 57 | 58 | self.open_orders_raw = [] 59 | self.open_orders = [] 60 | self.open_orders_sell = [] 61 | self.open_orders_buy = [] 62 | 63 | self.order_book_raw = [] 64 | self.order_book = {} 65 | self.order_book["buy"] = [] 66 | self.order_book["sell"] = [] 67 | 68 | self.sell_price = self.make_satoshi('0.0') 69 | self.buy_price = self.make_satoshi('0.0') 70 | self.price_spread = self.make_satoshi('0.0') 71 | self.sell_amount = self.make_satoshi('0.0') 72 | self.buy_amount = self.make_satoshi('0.0') 73 | self.trade = False 74 | 75 | # those are hardcoded. may be added to settings later. 76 | self.min_currency_balance = self.make_satoshi('0.00100000') 77 | # seconds to wait for exchange rate limits. 78 | self.exchange_wait_time = 0.8 79 | 80 | 81 | def make_satoshi(self, num): 82 | return decimal.Decimal(num).quantize(decimal.Decimal('1.00000000')) 83 | 84 | 85 | def load_open_orders(self): 86 | """ 87 | loads open orders. Resets the balances so load_balances method should be called after. 88 | """ 89 | self.total_coin_balance = self.make_satoshi('0.0') 90 | self.total_currency_balance = self.make_satoshi('0.0') 91 | self.open_orders_raw = self.polo.returnOpenOrders(currencyPair=self.my_pair) 92 | self.open_orders = [] 93 | self.open_orders_sell = [] 94 | self.open_orders_buy = [] 95 | for item in self.open_orders_raw: 96 | order = {} 97 | order['type'] = item['type'] 98 | order["order_number"] = item['orderNumber'] 99 | order["price"] = self.make_satoshi(item['rate']) 100 | order["amount"] = self.make_satoshi(item['amount']) 101 | order["total"] = self.make_satoshi(order['price'] * order['amount']) 102 | order["starting_amount"] = self.make_satoshi(item['startingAmount']) 103 | 104 | self.open_orders.append(order) 105 | if order['type'] == 'sell': 106 | self.open_orders_sell.append(order) 107 | self.total_coin_balance = self.total_coin_balance + order["amount"] 108 | else: 109 | self.open_orders_buy.append(order) 110 | self.total_currency_balance = self.total_currency_balance + order["total"] 111 | 112 | return self.open_orders 113 | 114 | 115 | def load_balances(self): 116 | # first load the open orders to get the balances in open orders. 117 | self.load_open_orders() 118 | # request from exchange 119 | self.balances = self.polo.returnBalances() 120 | # set the coin balance 121 | self.coin_balance = self.make_satoshi(self.balances[self.coin]) 122 | self.total_coin_balance = self.total_coin_balance + self.coin_balance 123 | # '0.00000001' makes things complicated. get rid of it. 124 | if self.coin_balance <= self.make_satoshi('0.00000001'): 125 | self.coin_balance = self.make_satoshi('0.0') 126 | if self.total_coin_balance <= self.make_satoshi('0.00000001'): 127 | self.total_coin_balance = self.make_satoshi('0.0') 128 | # set the main currency balance 129 | self.currency_balance = self.make_satoshi(self.balances[self.currency]) 130 | self.total_currency_balance = self.total_currency_balance + self.currency_balance 131 | # '0.00000001' makes things complicated. get rid of it. 132 | if self.currency_balance <= self.make_satoshi('0.00000001'): 133 | self.currency_balance = self.make_satoshi('0.0') 134 | if self.total_currency_balance <= self.make_satoshi('0.00000001'): 135 | self.total_currency_balance = self.make_satoshi('0.0') 136 | # added for debugging. make the BTC amount > 0 so we can test buying. 137 | # self.total_currency_balance = self.make_satoshi('0.10000000') 138 | 139 | 140 | def load_order_book(self): 141 | self.order_book_raw = self.polo.returnOrderBook(currencyPair=self.my_pair, depth='200') 142 | self.order_book["buy"] = [] 143 | self.order_book["sell"] = [] 144 | self.process_order_book('buy', self.order_book_raw["bids"]) 145 | self.process_order_book('sell', self.order_book_raw["asks"]) 146 | return self.order_book 147 | 148 | 149 | def process_order_book(self, order_type, order_book_raw): 150 | self.order_book[order_type] = [] 151 | total = self.make_satoshi("0.0") 152 | for item in order_book_raw: 153 | order = {} 154 | order['type'] = order_type 155 | order["price"] = self.make_satoshi(item[0]) 156 | order["amount"] = self.make_satoshi(item[1]) 157 | order["cur"] = self.make_satoshi(order["price"] * order["amount"]) 158 | total = self.make_satoshi(total + order["cur"]) 159 | order["total"] = total 160 | # mark the order if its my order. put order number from open_orders 161 | order['order_number'] = None 162 | for open_order in self.open_orders: 163 | if (open_order['type'] == order['type']) and (open_order["price"] == order["price"]): 164 | order["order_number"] = open_order['order_number'] 165 | print "order:", order 166 | 167 | self.order_book[order_type].append(order) 168 | 169 | return self.order_book[order_type] 170 | 171 | 172 | def find_sell_price(self): 173 | total = self.make_satoshi("0.0") 174 | for order in self.order_book['sell']: 175 | if order['order_number'] is None: 176 | total = self.make_satoshi(total + order["cur"]) 177 | if (order["amount"] >= self.dust_amount) or (total >= self.dust_total): 178 | return self.make_satoshi(order["price"] - self.make_satoshi("0.00000003")) 179 | 180 | return False 181 | 182 | 183 | def find_buy_price(self): 184 | total = self.make_satoshi("0.0") 185 | for order in self.order_book['buy']: 186 | if order['order_number'] is None: 187 | total = self.make_satoshi(total + order["cur"]) 188 | if (order["amount"] >= self.dust_amount) or (total >= self.dust_total): 189 | return self.make_satoshi(order["price"] + self.make_satoshi("0.00000003")) 190 | 191 | return False 192 | 193 | 194 | def decide_to_trade(self): 195 | self.sell_price = self.find_sell_price() 196 | self.buy_price = self.find_buy_price() 197 | self.price_spread = self.sell_price - self.buy_price 198 | 199 | print "Sell Price:", self.sell_price 200 | print "Buy Price:", self.buy_price 201 | print "Price Spread:", self.price_spread 202 | 203 | 204 | if (not self.sell_price) or (not self.buy_price): 205 | print "Something is wrong with sell and buy prices. Will not trade!" 206 | self.trade = False 207 | return False 208 | 209 | 210 | if self.total_currency_balance > self.min_currency_balance: 211 | print 'I have %s %s, will try to buy %s.' % ( 212 | self.total_currency_balance, self.currency, self.coin) 213 | self.trade = 'buy' 214 | return True 215 | else: 216 | if self.price_spread >= self.min_spread: 217 | print 'Spread is good. Will trade' 218 | # sell or buy? 219 | if self.total_coin_balance > 0: 220 | print 'I have %s %s, will try to sell %s for %s.' % ( 221 | self.total_coin_balance, self.coin, self.coin, 222 | self.currency) 223 | self.trade = 'sell' 224 | return True 225 | else: 226 | print 'I have nothing to trade.' 227 | self.trade = False 228 | else: 229 | print 'Price Spread is not good. Stop trading.' 230 | self.trade = False 231 | 232 | return False 233 | 234 | 235 | def cancel_open_orders(self, buy_sell): 236 | for order in self.open_orders: 237 | if order['type'] == buy_sell: 238 | print "canceling order:", order 239 | try: 240 | retval = self.polo.cancelOrder(order["order_number"]) 241 | except RuntimeError: 242 | retval = False 243 | print 'ERROR canceling order.' 244 | print "cancel order retval:", retval 245 | self.open_orders.remove(order) 246 | if buy_sell == 'sell': 247 | self.open_orders_sell.remove(order) 248 | else: 249 | self.open_orders_buy.remove(order) 250 | 251 | 252 | def cancel_open_order(self, order): 253 | print "canceling order:", order 254 | try: 255 | retval = self.polo.cancelOrder(order["order_number"]) 256 | except RuntimeError: 257 | retval = False 258 | print 'ERROR canceling order.' 259 | time.sleep(0.2) 260 | print "cancel order retval:", retval 261 | self.open_orders.remove(order) 262 | if order['type'] == 'sell': 263 | self.open_orders_sell.remove(order) 264 | else: 265 | self.open_orders_buy.remove(order) 266 | 267 | 268 | def add_sell_order(self): 269 | # compute the amount 270 | if self.total_coin_balance > self.max_trading_amount: 271 | self.sell_amount = self.max_trading_amount 272 | else: 273 | self.sell_amount = self.total_coin_balance 274 | 275 | print "self.sell_amount:", self.sell_amount 276 | # send order to exchange 277 | try: 278 | retval = self.polo.sell(currencyPair=self.my_pair, rate=self.sell_price, amount=self.sell_amount) 279 | except RuntimeError: 280 | print 'ERROR adding SELL order.' 281 | retval = False 282 | 283 | print retval 284 | 285 | return retval 286 | 287 | 288 | def sell(self): 289 | # cancel all buy orders first. 290 | self.cancel_open_orders('buy') 291 | # check open sell orders if the sell price is ok. 292 | for order in self.open_orders_sell: 293 | if order['price'] == self.sell_price: 294 | print "order is ok:", order 295 | else: 296 | # cancel the order. 297 | retval = self.cancel_open_order(order) 298 | 299 | print 'self.open_orders_sell:', len(self.open_orders_sell) 300 | if len(self.open_orders_sell) == 0: 301 | print 'adding a new sell order' 302 | retval = self.add_sell_order() 303 | 304 | 305 | def add_buy_order(self): 306 | # compute the amount 307 | if self.total_currency_balance > self.make_satoshi('0.00001000'): 308 | self.buy_amount = self.make_satoshi(self.total_currency_balance / self.buy_price) - self.make_satoshi('0.00000001') 309 | print "Buying amount:", self.buy_amount 310 | else: 311 | print "Buying amount is low. not buying:" 312 | return False 313 | 314 | # send order to exchange 315 | try: 316 | retval = self.polo.buy(currencyPair=self.my_pair, rate=self.buy_price, amount=self.buy_amount) 317 | except RuntimeError: 318 | print 'ERROR adding BUY order.' 319 | retval = False 320 | 321 | print retval 322 | 323 | return retval 324 | 325 | 326 | def buy(self): 327 | # cancel all buy orders first. 328 | self.cancel_open_orders('sell') 329 | # check open sell orders if the sell price is ok. 330 | for order in self.open_orders_buy: 331 | if order['price'] == self.buy_price: 332 | print "order is ok:", order 333 | else: 334 | # cancel the order. 335 | retval = self.cancel_open_order(order) 336 | 337 | print 'self.open_orders_buy:', len(self.open_orders_buy) 338 | if len(self.open_orders_buy) == 0: 339 | print 'adding a new buy order' 340 | retval = self.add_buy_order() 341 | 342 | 343 | def run_scalping(self): 344 | while True: 345 | now = datetime.datetime.now() 346 | print str(now) 347 | 348 | self.load_balances() 349 | self.load_order_book() 350 | 351 | print '%s Balance: %s' % (self.currency, self.total_currency_balance) 352 | print '%s Balance: %s' % (self.coin, self.total_coin_balance) 353 | 354 | # trade or not trade? 355 | trade = self.decide_to_trade() 356 | 357 | print "Trade?", trade 358 | 359 | if self.trade == 'sell': 360 | self.sell() 361 | elif self.trade == 'buy': 362 | self.buy() 363 | else: 364 | #Will not trade. Cancel all orders. 365 | self.cancel_open_orders('buy') 366 | self.cancel_open_orders('sell') 367 | 368 | print "." 369 | print "open orders:", self.open_orders 370 | print "." 371 | now = datetime.datetime.now() 372 | print str(now) 373 | 374 | print "Will wait a little bit for not to flood the exchange..." 375 | time.sleep(self.exchange_wait_time) 376 | 377 | 378 | def add_sell_all_order(self): 379 | # compute the amount 380 | self.sell_amount = self.total_coin_balance 381 | 382 | print "self.sell_amount:", self.sell_amount 383 | if self.sell_amount: 384 | # send order to exchange 385 | try: 386 | retval = self.polo.sell(currencyPair=self.my_pair, 387 | rate=self.sell_price, 388 | amount=self.sell_amount) 389 | except RuntimeError: 390 | print 'ERROR adding SELL ALL order.' 391 | retval = False 392 | 393 | print retval 394 | 395 | return retval 396 | else: 397 | return False 398 | 399 | 400 | def sell_all(self): 401 | # cancel all buy orders first. 402 | self.cancel_open_orders('buy') 403 | # check open sell orders if the sell price is ok. 404 | for order in self.open_orders_sell: 405 | if order['price'] == self.sell_price: 406 | print "order is ok:", order 407 | else: 408 | # cancel the order. 409 | retval = self.cancel_open_order(order) 410 | 411 | print 'self.open_orders_sell:', len(self.open_orders_sell) 412 | if len(self.open_orders_sell) == 0: 413 | print 'adding a new sell all order' 414 | retval = self.add_sell_all_order() 415 | 416 | 417 | def run_sell_all(self): 418 | self.trade = 'sell' 419 | while self.trade == 'sell': 420 | now = datetime.datetime.now() 421 | print str(now) 422 | 423 | self.load_balances() 424 | self.load_order_book() 425 | 426 | print '%s Balance: %s' % (self.currency, self.total_currency_balance) 427 | print '%s Balance: %s' % (self.coin, self.total_coin_balance) 428 | 429 | self.sell_price = self.find_sell_price() 430 | print "Sell Price:", self.sell_price 431 | 432 | if self.total_coin_balance > 0.0: 433 | print 'I have %s %s, will try to sell %s for %s.' % ( 434 | self.total_coin_balance, self.coin, self.coin, 435 | self.currency) 436 | self.trade = 'sell' 437 | else: 438 | print 'I have nothing to trade.' 439 | self.trade = False 440 | 441 | if self.trade == 'sell': 442 | self.sell_all() 443 | else: 444 | #Will not trade. Cancel all orders. 445 | self.cancel_open_orders('buy') 446 | self.cancel_open_orders('sell') 447 | 448 | print "." 449 | print "open orders:", self.open_orders 450 | print "." 451 | now = datetime.datetime.now() 452 | print str(now) 453 | 454 | print "Will wait a little bit for not to flood the exchange..." 455 | time.sleep(self.exchange_wait_time) 456 | 457 | 458 | def add_buy_all_order(self): 459 | # compute the amount 460 | if self.total_currency_balance > self.make_satoshi('0.00001000'): 461 | top = self.total_currency_balance / self.buy_price 462 | self.buy_amount = self.make_satoshi(top) - self.make_satoshi('0.00000001') 463 | print "Buying amount:", self.buy_amount 464 | else: 465 | print "Buying amount is low. not buying:" 466 | return False 467 | 468 | # send order to exchange 469 | try: 470 | retval = self.polo.buy(currencyPair=self.my_pair, rate=self.buy_price, amount=self.buy_amount) 471 | except: 472 | print 'ERROR adding BUY ALL order.' 473 | retval = False 474 | 475 | print retval 476 | 477 | return retval 478 | 479 | 480 | def buy_all(self): 481 | # cancel all buy orders first. 482 | self.cancel_open_orders('sell') 483 | # check open sell orders if the sell price is ok. 484 | for order in self.open_orders_buy: 485 | if order['price'] == self.buy_price: 486 | print "order is ok:", order 487 | else: 488 | # cancel the order. 489 | retval = self.cancel_open_order(order) 490 | 491 | print 'self.open_orders_buy:', len(self.open_orders_buy) 492 | if len(self.open_orders_buy) == 0: 493 | print 'adding a new buy all order' 494 | retval = self.add_buy_all_order() 495 | 496 | 497 | def run_buy_all(self): 498 | self.trade = 'buy' 499 | while self.trade == 'buy': 500 | now = datetime.datetime.now() 501 | print str(now) 502 | 503 | self.load_balances() 504 | self.load_order_book() 505 | 506 | print '%s Balance: %s' % (self.currency, self.total_currency_balance) 507 | print '%s Balance: %s' % (self.coin, self.total_coin_balance) 508 | 509 | self.buy_price = self.find_buy_price() 510 | print "Buy Price:", self.buy_price 511 | 512 | if self.total_currency_balance > self.min_currency_balance: 513 | print 'I have %s %s, will try to buy %s.' % (self.total_currency_balance, self.currency, self.coin) 514 | self.trade = 'buy' 515 | else: 516 | print 'I have nothing to trade.' 517 | self.trade = False 518 | 519 | if self.trade == 'buy': 520 | self.buy_all() 521 | else: 522 | #Will not trade. Cancel all orders. 523 | self.cancel_open_orders('buy') 524 | self.cancel_open_orders('sell') 525 | 526 | print "." 527 | print "open orders:", self.open_orders 528 | print "." 529 | now = datetime.datetime.now() 530 | print str(now) 531 | 532 | print "Will wait a little bit for not to flood the exchange..." 533 | time.sleep(self.exchange_wait_time) 534 | 535 | 536 | if __name__ == "__main__": 537 | PARSER = argparse.ArgumentParser() 538 | PARSER.add_argument( 539 | 'action', 540 | choices=['sell_all', 'buy_all', 'scalp'], 541 | help="What to do? sell_all, buy_all or scalp", 542 | ) 543 | 544 | ARGS = PARSER.parse_args() 545 | ACTION = ARGS.action 546 | 547 | POLO_API_KEY = settings['polo_api']['key'] 548 | POLO_API_SECRET = settings['polo_api']['secret'] 549 | TRACE_CURRENCY = settings['coin']['my_coin'] 550 | RETURN_CURRENCY = settings['coin']['currency'] 551 | DUST_TOTAL = settings['dust_total'] 552 | DUST_AMOUNT = settings['dust_amount'] 553 | MIN_SPREAD = settings['min_spread'] 554 | MAX_TRADING_AMOUNT = settings['max_trading_amount'] 555 | 556 | TRADER = Trader(POLO_API_KEY, POLO_API_SECRET, TRACE_CURRENCY, RETURN_CURRENCY, 557 | DUST_TOTAL, DUST_AMOUNT, MIN_SPREAD, MAX_TRADING_AMOUNT) 558 | 559 | if ACTION == "scalp": 560 | TRADER.run_scalping() 561 | elif ACTION == "sell_all": 562 | TRADER.run_sell_all() 563 | elif ACTION == "buy_all": 564 | TRADER.run_buy_all() 565 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. We, the Free Software Foundation, use the 18 | GNU General Public License for most of our software; it applies also to 19 | any other work released this way by its authors. You can apply it to 20 | your programs, too. 21 | 22 | When we speak of free software, we are referring to freedom, not 23 | price. Our General Public Licenses are designed to make sure that you 24 | have the freedom to distribute copies of free software (and charge for 25 | them if you wish), that you receive source code or can get it if you 26 | want it, that you can change the software or use pieces of it in new 27 | free programs, and that you know you can do these things. 28 | 29 | To protect your rights, we need to prevent others from denying you 30 | these rights or asking you to surrender the rights. Therefore, you have 31 | certain responsibilities if you distribute copies of the software, or if 32 | you modify it: responsibilities to respect the freedom of others. 33 | 34 | For example, if you distribute copies of such a program, whether 35 | gratis or for a fee, you must pass on to the recipients the same 36 | freedoms that you received. You must make sure that they, too, receive 37 | or can get the source code. And you must show them these terms so they 38 | know their rights. 39 | 40 | Developers that use the GNU GPL protect your rights with two steps: 41 | (1) assert copyright on the software, and (2) offer you this License 42 | giving you legal permission to copy, distribute and/or modify it. 43 | 44 | For the developers' and authors' protection, the GPL clearly explains 45 | that there is no warranty for this free software. For both users' and 46 | authors' sake, the GPL requires that modified versions be marked as 47 | changed, so that their problems will not be attributed erroneously to 48 | authors of previous versions. 49 | 50 | Some devices are designed to deny users access to install or run 51 | modified versions of the software inside them, although the manufacturer 52 | can do so. This is fundamentally incompatible with the aim of 53 | protecting users' freedom to change the software. The systematic 54 | pattern of such abuse occurs in the area of products for individuals to 55 | use, which is precisely where it is most unacceptable. Therefore, we 56 | have designed this version of the GPL to prohibit the practice for those 57 | products. If such problems arise substantially in other domains, we 58 | stand ready to extend this provision to those domains in future versions 59 | of the GPL, as needed to protect the freedom of users. 60 | 61 | Finally, every program is threatened constantly by software patents. 62 | States should not allow patents to restrict development and use of 63 | software on general-purpose computers, but in those that do, we wish to 64 | avoid the special danger that patents applied to a free program could 65 | make it effectively proprietary. To prevent this, the GPL assures that 66 | patents cannot be used to render the program non-free. 67 | 68 | The precise terms and conditions for copying, distribution and 69 | modification follow. 70 | 71 | TERMS AND CONDITIONS 72 | 73 | 0. Definitions. 74 | 75 | "This License" refers to version 3 of the GNU General Public License. 76 | 77 | "Copyright" also means copyright-like laws that apply to other kinds of 78 | works, such as semiconductor masks. 79 | 80 | "The Program" refers to any copyrightable work licensed under this 81 | License. Each licensee is addressed as "you". "Licensees" and 82 | "recipients" may be individuals or organizations. 83 | 84 | To "modify" a work means to copy from or adapt all or part of the work 85 | in a fashion requiring copyright permission, other than the making of an 86 | exact copy. The resulting work is called a "modified version" of the 87 | earlier work or a work "based on" the earlier work. 88 | 89 | A "covered work" means either the unmodified Program or a work based 90 | on the Program. 91 | 92 | To "propagate" a work means to do anything with it that, without 93 | permission, would make you directly or secondarily liable for 94 | infringement under applicable copyright law, except executing it on a 95 | computer or modifying a private copy. Propagation includes copying, 96 | distribution (with or without modification), making available to the 97 | public, and in some countries other activities as well. 98 | 99 | To "convey" a work means any kind of propagation that enables other 100 | parties to make or receive copies. Mere interaction with a user through 101 | a computer network, with no transfer of a copy, is not conveying. 102 | 103 | An interactive user interface displays "Appropriate Legal Notices" 104 | to the extent that it includes a convenient and prominently visible 105 | feature that (1) displays an appropriate copyright notice, and (2) 106 | tells the user that there is no warranty for the work (except to the 107 | extent that warranties are provided), that licensees may convey the 108 | work under this License, and how to view a copy of this License. If 109 | the interface presents a list of user commands or options, such as a 110 | menu, a prominent item in the list meets this criterion. 111 | 112 | 1. Source Code. 113 | 114 | The "source code" for a work means the preferred form of the work 115 | for making modifications to it. "Object code" means any non-source 116 | form of a work. 117 | 118 | A "Standard Interface" means an interface that either is an official 119 | standard defined by a recognized standards body, or, in the case of 120 | interfaces specified for a particular programming language, one that 121 | is widely used among developers working in that language. 122 | 123 | The "System Libraries" of an executable work include anything, other 124 | than the work as a whole, that (a) is included in the normal form of 125 | packaging a Major Component, but which is not part of that Major 126 | Component, and (b) serves only to enable use of the work with that 127 | Major Component, or to implement a Standard Interface for which an 128 | implementation is available to the public in source code form. A 129 | "Major Component", in this context, means a major essential component 130 | (kernel, window system, and so on) of the specific operating system 131 | (if any) on which the executable work runs, or a compiler used to 132 | produce the work, or an object code interpreter used to run it. 133 | 134 | The "Corresponding Source" for a work in object code form means all 135 | the source code needed to generate, install, and (for an executable 136 | work) run the object code and to modify the work, including scripts to 137 | control those activities. However, it does not include the work's 138 | System Libraries, or general-purpose tools or generally available free 139 | programs which are used unmodified in performing those activities but 140 | which are not part of the work. For example, Corresponding Source 141 | includes interface definition files associated with source files for 142 | the work, and the source code for shared libraries and dynamically 143 | linked subprograms that the work is specifically designed to require, 144 | such as by intimate data communication or control flow between those 145 | subprograms and other parts of the work. 146 | 147 | The Corresponding Source need not include anything that users 148 | can regenerate automatically from other parts of the Corresponding 149 | Source. 150 | 151 | The Corresponding Source for a work in source code form is that 152 | same work. 153 | 154 | 2. Basic Permissions. 155 | 156 | All rights granted under this License are granted for the term of 157 | copyright on the Program, and are irrevocable provided the stated 158 | conditions are met. This License explicitly affirms your unlimited 159 | permission to run the unmodified Program. The output from running a 160 | covered work is covered by this License only if the output, given its 161 | content, constitutes a covered work. This License acknowledges your 162 | rights of fair use or other equivalent, as provided by copyright law. 163 | 164 | You may make, run and propagate covered works that you do not 165 | convey, without conditions so long as your license otherwise remains 166 | in force. You may convey covered works to others for the sole purpose 167 | of having them make modifications exclusively for you, or provide you 168 | with facilities for running those works, provided that you comply with 169 | the terms of this License in conveying all material for which you do 170 | not control copyright. Those thus making or running the covered works 171 | for you must do so exclusively on your behalf, under your direction 172 | and control, on terms that prohibit them from making any copies of 173 | your copyrighted material outside their relationship with you. 174 | 175 | Conveying under any other circumstances is permitted solely under 176 | the conditions stated below. Sublicensing is not allowed; section 10 177 | makes it unnecessary. 178 | 179 | 3. Protecting Users' Legal Rights From Anti-Circumvention Law. 180 | 181 | No covered work shall be deemed part of an effective technological 182 | measure under any applicable law fulfilling obligations under article 183 | 11 of the WIPO copyright treaty adopted on 20 December 1996, or 184 | similar laws prohibiting or restricting circumvention of such 185 | measures. 186 | 187 | When you convey a covered work, you waive any legal power to forbid 188 | circumvention of technological measures to the extent such circumvention 189 | is effected by exercising rights under this License with respect to 190 | the covered work, and you disclaim any intention to limit operation or 191 | modification of the work as a means of enforcing, against the work's 192 | users, your or third parties' legal rights to forbid circumvention of 193 | technological measures. 194 | 195 | 4. Conveying Verbatim Copies. 196 | 197 | You may convey verbatim copies of the Program's source code as you 198 | receive it, in any medium, provided that you conspicuously and 199 | appropriately publish on each copy an appropriate copyright notice; 200 | keep intact all notices stating that this License and any 201 | non-permissive terms added in accord with section 7 apply to the code; 202 | keep intact all notices of the absence of any warranty; and give all 203 | recipients a copy of this License along with the Program. 204 | 205 | You may charge any price or no price for each copy that you convey, 206 | and you may offer support or warranty protection for a fee. 207 | 208 | 5. Conveying Modified Source Versions. 209 | 210 | You may convey a work based on the Program, or the modifications to 211 | produce it from the Program, in the form of source code under the 212 | terms of section 4, provided that you also meet all of these conditions: 213 | 214 | a) The work must carry prominent notices stating that you modified 215 | it, and giving a relevant date. 216 | 217 | b) The work must carry prominent notices stating that it is 218 | released under this License and any conditions added under section 219 | 7. This requirement modifies the requirement in section 4 to 220 | "keep intact all notices". 221 | 222 | c) You must license the entire work, as a whole, under this 223 | License to anyone who comes into possession of a copy. This 224 | License will therefore apply, along with any applicable section 7 225 | additional terms, to the whole of the work, and all its parts, 226 | regardless of how they are packaged. This License gives no 227 | permission to license the work in any other way, but it does not 228 | invalidate such permission if you have separately received it. 229 | 230 | d) If the work has interactive user interfaces, each must display 231 | Appropriate Legal Notices; however, if the Program has interactive 232 | interfaces that do not display Appropriate Legal Notices, your 233 | work need not make them do so. 234 | 235 | A compilation of a covered work with other separate and independent 236 | works, which are not by their nature extensions of the covered work, 237 | and which are not combined with it such as to form a larger program, 238 | in or on a volume of a storage or distribution medium, is called an 239 | "aggregate" if the compilation and its resulting copyright are not 240 | used to limit the access or legal rights of the compilation's users 241 | beyond what the individual works permit. Inclusion of a covered work 242 | in an aggregate does not cause this License to apply to the other 243 | parts of the aggregate. 244 | 245 | 6. Conveying Non-Source Forms. 246 | 247 | You may convey a covered work in object code form under the terms 248 | of sections 4 and 5, provided that you also convey the 249 | machine-readable Corresponding Source under the terms of this License, 250 | in one of these ways: 251 | 252 | a) Convey the object code in, or embodied in, a physical product 253 | (including a physical distribution medium), accompanied by the 254 | Corresponding Source fixed on a durable physical medium 255 | customarily used for software interchange. 256 | 257 | b) Convey the object code in, or embodied in, a physical product 258 | (including a physical distribution medium), accompanied by a 259 | written offer, valid for at least three years and valid for as 260 | long as you offer spare parts or customer support for that product 261 | model, to give anyone who possesses the object code either (1) a 262 | copy of the Corresponding Source for all the software in the 263 | product that is covered by this License, on a durable physical 264 | medium customarily used for software interchange, for a price no 265 | more than your reasonable cost of physically performing this 266 | conveying of source, or (2) access to copy the 267 | Corresponding Source from a network server at no charge. 268 | 269 | c) Convey individual copies of the object code with a copy of the 270 | written offer to provide the Corresponding Source. This 271 | alternative is allowed only occasionally and noncommercially, and 272 | only if you received the object code with such an offer, in accord 273 | with subsection 6b. 274 | 275 | d) Convey the object code by offering access from a designated 276 | place (gratis or for a charge), and offer equivalent access to the 277 | Corresponding Source in the same way through the same place at no 278 | further charge. You need not require recipients to copy the 279 | Corresponding Source along with the object code. If the place to 280 | copy the object code is a network server, the Corresponding Source 281 | may be on a different server (operated by you or a third party) 282 | that supports equivalent copying facilities, provided you maintain 283 | clear directions next to the object code saying where to find the 284 | Corresponding Source. Regardless of what server hosts the 285 | Corresponding Source, you remain obligated to ensure that it is 286 | available for as long as needed to satisfy these requirements. 287 | 288 | e) Convey the object code using peer-to-peer transmission, provided 289 | you inform other peers where the object code and Corresponding 290 | Source of the work are being offered to the general public at no 291 | charge under subsection 6d. 292 | 293 | A separable portion of the object code, whose source code is excluded 294 | from the Corresponding Source as a System Library, need not be 295 | included in conveying the object code work. 296 | 297 | A "User Product" is either (1) a "consumer product", which means any 298 | tangible personal property which is normally used for personal, family, 299 | or household purposes, or (2) anything designed or sold for incorporation 300 | into a dwelling. In determining whether a product is a consumer product, 301 | doubtful cases shall be resolved in favor of coverage. For a particular 302 | product received by a particular user, "normally used" refers to a 303 | typical or common use of that class of product, regardless of the status 304 | of the particular user or of the way in which the particular user 305 | actually uses, or expects or is expected to use, the product. A product 306 | is a consumer product regardless of whether the product has substantial 307 | commercial, industrial or non-consumer uses, unless such uses represent 308 | the only significant mode of use of the product. 309 | 310 | "Installation Information" for a User Product means any methods, 311 | procedures, authorization keys, or other information required to install 312 | and execute modified versions of a covered work in that User Product from 313 | a modified version of its Corresponding Source. The information must 314 | suffice to ensure that the continued functioning of the modified object 315 | code is in no case prevented or interfered with solely because 316 | modification has been made. 317 | 318 | If you convey an object code work under this section in, or with, or 319 | specifically for use in, a User Product, and the conveying occurs as 320 | part of a transaction in which the right of possession and use of the 321 | User Product is transferred to the recipient in perpetuity or for a 322 | fixed term (regardless of how the transaction is characterized), the 323 | Corresponding Source conveyed under this section must be accompanied 324 | by the Installation Information. But this requirement does not apply 325 | if neither you nor any third party retains the ability to install 326 | modified object code on the User Product (for example, the work has 327 | been installed in ROM). 328 | 329 | The requirement to provide Installation Information does not include a 330 | requirement to continue to provide support service, warranty, or updates 331 | for a work that has been modified or installed by the recipient, or for 332 | the User Product in which it has been modified or installed. Access to a 333 | network may be denied when the modification itself materially and 334 | adversely affects the operation of the network or violates the rules and 335 | protocols for communication across the network. 336 | 337 | Corresponding Source conveyed, and Installation Information provided, 338 | in accord with this section must be in a format that is publicly 339 | documented (and with an implementation available to the public in 340 | source code form), and must require no special password or key for 341 | unpacking, reading or copying. 342 | 343 | 7. Additional Terms. 344 | 345 | "Additional permissions" are terms that supplement the terms of this 346 | License by making exceptions from one or more of its conditions. 347 | Additional permissions that are applicable to the entire Program shall 348 | be treated as though they were included in this License, to the extent 349 | that they are valid under applicable law. If additional permissions 350 | apply only to part of the Program, that part may be used separately 351 | under those permissions, but the entire Program remains governed by 352 | this License without regard to the additional permissions. 353 | 354 | When you convey a copy of a covered work, you may at your option 355 | remove any additional permissions from that copy, or from any part of 356 | it. (Additional permissions may be written to require their own 357 | removal in certain cases when you modify the work.) You may place 358 | additional permissions on material, added by you to a covered work, 359 | for which you have or can give appropriate copyright permission. 360 | 361 | Notwithstanding any other provision of this License, for material you 362 | add to a covered work, you may (if authorized by the copyright holders of 363 | that material) supplement the terms of this License with terms: 364 | 365 | a) Disclaiming warranty or limiting liability differently from the 366 | terms of sections 15 and 16 of this License; or 367 | 368 | b) Requiring preservation of specified reasonable legal notices or 369 | author attributions in that material or in the Appropriate Legal 370 | Notices displayed by works containing it; or 371 | 372 | c) Prohibiting misrepresentation of the origin of that material, or 373 | requiring that modified versions of such material be marked in 374 | reasonable ways as different from the original version; or 375 | 376 | d) Limiting the use for publicity purposes of names of licensors or 377 | authors of the material; or 378 | 379 | e) Declining to grant rights under trademark law for use of some 380 | trade names, trademarks, or service marks; or 381 | 382 | f) Requiring indemnification of licensors and authors of that 383 | material by anyone who conveys the material (or modified versions of 384 | it) with contractual assumptions of liability to the recipient, for 385 | any liability that these contractual assumptions directly impose on 386 | those licensors and authors. 387 | 388 | All other non-permissive additional terms are considered "further 389 | restrictions" within the meaning of section 10. If the Program as you 390 | received it, or any part of it, contains a notice stating that it is 391 | governed by this License along with a term that is a further 392 | restriction, you may remove that term. If a license document contains 393 | a further restriction but permits relicensing or conveying under this 394 | License, you may add to a covered work material governed by the terms 395 | of that license document, provided that the further restriction does 396 | not survive such relicensing or conveying. 397 | 398 | If you add terms to a covered work in accord with this section, you 399 | must place, in the relevant source files, a statement of the 400 | additional terms that apply to those files, or a notice indicating 401 | where to find the applicable terms. 402 | 403 | Additional terms, permissive or non-permissive, may be stated in the 404 | form of a separately written license, or stated as exceptions; 405 | the above requirements apply either way. 406 | 407 | 8. Termination. 408 | 409 | You may not propagate or modify a covered work except as expressly 410 | provided under this License. Any attempt otherwise to propagate or 411 | modify it is void, and will automatically terminate your rights under 412 | this License (including any patent licenses granted under the third 413 | paragraph of section 11). 414 | 415 | However, if you cease all violation of this License, then your 416 | license from a particular copyright holder is reinstated (a) 417 | provisionally, unless and until the copyright holder explicitly and 418 | finally terminates your license, and (b) permanently, if the copyright 419 | holder fails to notify you of the violation by some reasonable means 420 | prior to 60 days after the cessation. 421 | 422 | Moreover, your license from a particular copyright holder is 423 | reinstated permanently if the copyright holder notifies you of the 424 | violation by some reasonable means, this is the first time you have 425 | received notice of violation of this License (for any work) from that 426 | copyright holder, and you cure the violation prior to 30 days after 427 | your receipt of the notice. 428 | 429 | Termination of your rights under this section does not terminate the 430 | licenses of parties who have received copies or rights from you under 431 | this License. If your rights have been terminated and not permanently 432 | reinstated, you do not qualify to receive new licenses for the same 433 | material under section 10. 434 | 435 | 9. Acceptance Not Required for Having Copies. 436 | 437 | You are not required to accept this License in order to receive or 438 | run a copy of the Program. Ancillary propagation of a covered work 439 | occurring solely as a consequence of using peer-to-peer transmission 440 | to receive a copy likewise does not require acceptance. However, 441 | nothing other than this License grants you permission to propagate or 442 | modify any covered work. These actions infringe copyright if you do 443 | not accept this License. Therefore, by modifying or propagating a 444 | covered work, you indicate your acceptance of this License to do so. 445 | 446 | 10. Automatic Licensing of Downstream Recipients. 447 | 448 | Each time you convey a covered work, the recipient automatically 449 | receives a license from the original licensors, to run, modify and 450 | propagate that work, subject to this License. You are not responsible 451 | for enforcing compliance by third parties with this License. 452 | 453 | An "entity transaction" is a transaction transferring control of an 454 | organization, or substantially all assets of one, or subdividing an 455 | organization, or merging organizations. If propagation of a covered 456 | work results from an entity transaction, each party to that 457 | transaction who receives a copy of the work also receives whatever 458 | licenses to the work the party's predecessor in interest had or could 459 | give under the previous paragraph, plus a right to possession of the 460 | Corresponding Source of the work from the predecessor in interest, if 461 | the predecessor has it or can get it with reasonable efforts. 462 | 463 | You may not impose any further restrictions on the exercise of the 464 | rights granted or affirmed under this License. For example, you may 465 | not impose a license fee, royalty, or other charge for exercise of 466 | rights granted under this License, and you may not initiate litigation 467 | (including a cross-claim or counterclaim in a lawsuit) alleging that 468 | any patent claim is infringed by making, using, selling, offering for 469 | sale, or importing the Program or any portion of it. 470 | 471 | 11. Patents. 472 | 473 | A "contributor" is a copyright holder who authorizes use under this 474 | License of the Program or a work on which the Program is based. The 475 | work thus licensed is called the contributor's "contributor version". 476 | 477 | A contributor's "essential patent claims" are all patent claims 478 | owned or controlled by the contributor, whether already acquired or 479 | hereafter acquired, that would be infringed by some manner, permitted 480 | by this License, of making, using, or selling its contributor version, 481 | but do not include claims that would be infringed only as a 482 | consequence of further modification of the contributor version. For 483 | purposes of this definition, "control" includes the right to grant 484 | patent sublicenses in a manner consistent with the requirements of 485 | this License. 486 | 487 | Each contributor grants you a non-exclusive, worldwide, royalty-free 488 | patent license under the contributor's essential patent claims, to 489 | make, use, sell, offer for sale, import and otherwise run, modify and 490 | propagate the contents of its contributor version. 491 | 492 | In the following three paragraphs, a "patent license" is any express 493 | agreement or commitment, however denominated, not to enforce a patent 494 | (such as an express permission to practice a patent or covenant not to 495 | sue for patent infringement). To "grant" such a patent license to a 496 | party means to make such an agreement or commitment not to enforce a 497 | patent against the party. 498 | 499 | If you convey a covered work, knowingly relying on a patent license, 500 | and the Corresponding Source of the work is not available for anyone 501 | to copy, free of charge and under the terms of this License, through a 502 | publicly available network server or other readily accessible means, 503 | then you must either (1) cause the Corresponding Source to be so 504 | available, or (2) arrange to deprive yourself of the benefit of the 505 | patent license for this particular work, or (3) arrange, in a manner 506 | consistent with the requirements of this License, to extend the patent 507 | license to downstream recipients. "Knowingly relying" means you have 508 | actual knowledge that, but for the patent license, your conveying the 509 | covered work in a country, or your recipient's use of the covered work 510 | in a country, would infringe one or more identifiable patents in that 511 | country that you have reason to believe are valid. 512 | 513 | If, pursuant to or in connection with a single transaction or 514 | arrangement, you convey, or propagate by procuring conveyance of, a 515 | covered work, and grant a patent license to some of the parties 516 | receiving the covered work authorizing them to use, propagate, modify 517 | or convey a specific copy of the covered work, then the patent license 518 | you grant is automatically extended to all recipients of the covered 519 | work and works based on it. 520 | 521 | A patent license is "discriminatory" if it does not include within 522 | the scope of its coverage, prohibits the exercise of, or is 523 | conditioned on the non-exercise of one or more of the rights that are 524 | specifically granted under this License. You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------