├── PEDiffGen.vcxproj.filters
├── PEDiffGen.sln
├── README.md
├── .gitignore
├── PEDiffGen.cpp
├── PEDiffGen.vcxproj
└── LICENSE


/PEDiffGen.vcxproj.filters:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="utf-8"?>
 2 | <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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 4 |     <Filter Include="Source Files">
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 6 |       <Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
 7 |     </Filter>
 8 |     <Filter Include="Header Files">
 9 |       <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
10 |       <Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
11 |     </Filter>
12 |     <Filter Include="Resource Files">
13 |       <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
14 |       <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
15 |     </Filter>
16 |   </ItemGroup>
17 |   <ItemGroup>
18 |     <ClCompile Include="PEDiffGen.cpp">
19 |       <Filter>Source Files</Filter>
20 |     </ClCompile>
21 |   </ItemGroup>
22 | </Project>


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/PEDiffGen.sln:
--------------------------------------------------------------------------------
 1 | 
 2 | Microsoft Visual Studio Solution File, Format Version 12.00
 3 | # Visual Studio Version 16
 4 | VisualStudioVersion = 16.0.31515.178
 5 | MinimumVisualStudioVersion = 10.0.40219.1
 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "PEDiffGen", "PEDiffGen.vcxproj", "{3B8926BE-360F-4644-BB53-DC76DB4380B2}"
 7 | EndProject
 8 | Global
 9 | 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
10 | 		Debug|x64 = Debug|x64
11 | 		Debug|x86 = Debug|x86
12 | 		Release|x64 = Release|x64
13 | 		Release|x86 = Release|x86
14 | 	EndGlobalSection
15 | 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
16 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Debug|x64.ActiveCfg = Debug|x64
17 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Debug|x64.Build.0 = Debug|x64
18 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Debug|x86.ActiveCfg = Debug|Win32
19 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Debug|x86.Build.0 = Debug|Win32
20 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Release|x64.ActiveCfg = Release|x64
21 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Release|x64.Build.0 = Release|x64
22 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Release|x86.ActiveCfg = Release|Win32
23 | 		{3B8926BE-360F-4644-BB53-DC76DB4380B2}.Release|x86.Build.0 = Release|Win32
24 | 	EndGlobalSection
25 | 	GlobalSection(SolutionProperties) = preSolution
26 | 		HideSolutionNode = FALSE
27 | 	EndGlobalSection
28 | 	GlobalSection(ExtensibilityGlobals) = postSolution
29 | 		SolutionGuid = {9D91100B-222C-416B-9F75-6748DAF45E06}
30 | 	EndGlobalSection
31 | EndGlobal
32 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # PEDiffGen
 2 | 
 3 | A simple PE subtraction utility.
 4 | 
 5 | ```
 6 | PEDiffGen.exe <pe1> <pe2> <output>
 7 | ```
 8 | 
 9 | The above command generates the result of pe1 - pe2 in memory (as in, matching up with virtual addresses). This can be applied onto an in-memory image easily:
10 | 
11 | ```cpp
12 |   for (size_t i = 0; i < diff_size; i += 0x1000)
13 |   {
14 |     const auto curr = diff + i;
15 |     const auto chunk_size = std::min((size_t)(diff_size - i), (size_t)0x1000);
16 |     if (std::all_of(curr, curr + chunk_size, [](uint8_t c) { return !!c; }))
17 |       continue;
18 |     uint8_t page[0x1000];
19 |     std::transform(curr, curr + chunk_size, dll_base + i, page, [](uint8_t a, uint8_t b) { return a + b; });
20 |     unprotect_memcpy(dll_base + i, page, chunk_size);
21 |   }
22 | ```
23 | 
24 | It is recommended that you compress the subtraction result as most of it is zeros. After compression, this should produce one of the smallest possible footprints compared to other diffing methods.
25 | 
26 | ## License
27 | 
28 |     PEDiffGen - A PE file subtraction tool
29 |     Copyright (C) 2021  namazso <admin@namazso.eu>
30 | 
31 |     This program is free software: you can redistribute it and/or modify
32 |     it under the terms of the GNU General Public License as published by
33 |     the Free Software Foundation, either version 3 of the License, or
34 |     (at your option) any later version.
35 | 
36 |     This program is distributed in the hope that it will be useful,
37 |     but WITHOUT ANY WARRANTY; without even the implied warranty of
38 |     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
39 |     GNU General Public License for more details.
40 | 
41 |     You should have received a copy of the GNU General Public License
42 |     along with this program.  If not, see <https://www.gnu.org/licenses/>.
43 | 


--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
  1 | ## Ignore Visual Studio temporary files, build results, and
  2 | ## files generated by popular Visual Studio add-ons.
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  4 | # User-specific files
  5 | *.suo
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 11 | *.userprefs
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 13 | # Build results
 14 | [Dd]ebug/
 15 | [Dd]ebugPublic/
 16 | [Rr]elease/
 17 | [Rr]eleases/
 18 | bld/
 19 | [Bb]in/
 20 | [Oo]bj/
 21 | [Ll]og/
 22 | 
 23 | # Visual Studio 2015 cache/options directory
 24 | .vs/
 25 | # Uncomment if you have tasks that create the project's static files in wwwroot
 26 | #wwwroot/
 27 | 
 28 | # MSTest test Results
 29 | [Tt]est[Rr]esult*/
 30 | [Bb]uild[Ll]og.*
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 32 | # NUNIT
 33 | *.VisualState.xml
 34 | TestResult.xml
 35 | 
 36 | # Build Results of an ATL Project
 37 | [Dd]ebugPS/
 38 | [Rr]eleasePS/
 39 | dlldata.c
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 41 | # DNX
 42 | project.lock.json
 43 | project.fragment.lock.json
 44 | artifacts/
 45 | 
 46 | *_i.c
 47 | *_p.c
 48 | *_i.h
 49 | *.ilk
 50 | *.meta
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 52 | *.pch
 53 | *.pdb
 54 | *.pgc
 55 | *.pgd
 56 | *.rsp
 57 | *.sbr
 58 | *.tlb
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 60 | *.tlh
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 66 | .builds
 67 | *.pidb
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 72 | _Chutzpah*
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 75 | ipch/
 76 | *.aps
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132 | DocProject/Help/*.hhp
133 | DocProject/Help/Html2
134 | DocProject/Help/html
135 | 
136 | # Click-Once directory
137 | publish/
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139 | # Publish Web Output
140 | *.[Pp]ublish.xml
141 | *.azurePubxml
142 | # TODO: Comment the next line if you want to checkin your web deploy settings
143 | # but database connection strings (with potential passwords) will be unencrypted
144 | #*.pubxml
145 | *.publishproj
146 | 
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148 | # checkin your Azure Web App publish settings, but sensitive information contained
149 | # in these scripts will be unencrypted
150 | PublishScripts/
151 | 
152 | # NuGet Packages
153 | *.nupkg
154 | # The packages folder can be ignored because of Package Restore
155 | **/packages/*
156 | # except build/, which is used as an MSBuild target.
157 | !**/packages/build/
158 | # Uncomment if necessary however generally it will be regenerated when needed
159 | #!**/packages/repositories.config
160 | # NuGet v3's project.json files produces more ignoreable files
161 | *.nuget.props
162 | *.nuget.targets
163 | 
164 | # Microsoft Azure Build Output
165 | csx/
166 | *.build.csdef
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168 | # Microsoft Azure Emulator
169 | ecf/
170 | rcf/
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173 | AppPackages/
174 | BundleArtifacts/
175 | Package.StoreAssociation.xml
176 | _pkginfo.txt
177 | 
178 | # Visual Studio cache files
179 | # files ending in .cache can be ignored
180 | *.[Cc]ache
181 | # but keep track of directories ending in .cache
182 | !*.[Cc]ache/
183 | 
184 | # Others
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186 | ~$*
187 | *~
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189 | *.dbproj.schemaview
190 | *.jfm
191 | *.pfx
192 | *.publishsettings
193 | node_modules/
194 | orleans.codegen.cs
195 | 
196 | # Since there are multiple workflows, uncomment next line to ignore bower_components
197 | # (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
198 | #bower_components/
199 | 
200 | # RIA/Silverlight projects
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213 | *.ldf
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232 | # Visual Studio 6 workspace options file
233 | *.opt
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235 | # Visual Studio LightSwitch build output
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238 | **/*.DesktopClient/ModelManifest.xml
239 | **/*.Server/GeneratedArtifacts
240 | **/*.Server/ModelManifest.xml
241 | _Pvt_Extensions
242 | 
243 | # Paket dependency manager
244 | .paket/paket.exe
245 | paket-files/
246 | 
247 | # FAKE - F# Make
248 | .fake/
249 | 
250 | # JetBrains Rider
251 | .idea/
252 | *.sln.iml
253 | 
254 | # CodeRush
255 | .cr/
256 | 
257 | # Python Tools for Visual Studio (PTVS)
258 | __pycache__/
259 | *.pyc


--------------------------------------------------------------------------------
/PEDiffGen.cpp:
--------------------------------------------------------------------------------
  1 | // PEDiffGen - A PE file subtraction tool
  2 | // Copyright (C) 2021  namazso <admin@namazso.eu>
  3 | // 
  4 | // This program is free software: you can redistribute it and/or modify
  5 | // it under the terms of the GNU General Public License as published by
  6 | // the Free Software Foundation, either version 3 of the License, or
  7 | // (at your option) any later version.
  8 | // 
  9 | // This program is distributed in the hope that it will be useful,
 10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
 11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12 | // GNU General Public License for more details.
 13 | // 
 14 | // You should have received a copy of the GNU General Public License
 15 | // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 16 | #include <Windows.h>
 17 | #include <winternl.h>
 18 | #include <fstream>
 19 | #include <vector>
 20 | #include <array>
 21 | #include <algorithm>
 22 | #include <cassert>
 23 | 
 24 | std::vector<uint8_t> read_all(const char* path)
 25 | {
 26 |   std::ifstream is(path, std::ios::binary);
 27 |   if (!is.good() || !is.is_open())
 28 |     return {};
 29 |   is.seekg(0, std::ifstream::end);
 30 |   std::vector<uint8_t> data;
 31 |   data.resize((size_t)is.tellg());
 32 |   is.seekg(0, std::ifstream::beg);
 33 |   is.read(reinterpret_cast<char*>(data.data()), (std::streamsize)data.size());
 34 |   return data;
 35 | }
 36 | 
 37 | void write_all(const char* path, const void* data, size_t size)
 38 | {
 39 |   std::ofstream os(path, std::ios::binary);
 40 |   os.write((const char*)data, size);
 41 |   os.close();
 42 | }
 43 | 
 44 | template <bool Is64>
 45 | int main2(const uint8_t* pe1, const uint8_t* pe2, const char* out_filename)
 46 | {
 47 |   using NT_HEADERS = std::conditional_t<Is64, IMAGE_NT_HEADERS64, IMAGE_NT_HEADERS32>;
 48 | 
 49 |   const auto dosh1 = (const IMAGE_DOS_HEADER*)pe1;
 50 |   const auto dosh2 = (const IMAGE_DOS_HEADER*)pe2;
 51 |   const auto peh1 = (const NT_HEADERS*)(pe1 + dosh1->e_lfanew);
 52 |   const auto peh2 = (const NT_HEADERS*)(pe2 + dosh2->e_lfanew);
 53 | 
 54 |   if (peh1->OptionalHeader.SizeOfHeaders != peh2->OptionalHeader.SizeOfHeaders)
 55 |   {
 56 |     fprintf(stderr, "Header size mismatch!!\n");
 57 |     return -7;
 58 |   }
 59 | 
 60 |   std::vector<uint8_t> out_file;
 61 |   const auto do_compare = [&out_file](const uint8_t* it1, const uint8_t* it2, size_t size, uint32_t offset)
 62 |   {
 63 |     if (out_file.size() < offset + size)
 64 |       out_file.resize(offset + size);
 65 |     std::transform(it1, it1 + size, it2, out_file.begin() + offset, [](uint8_t a, uint8_t b)
 66 |       {
 67 |         return (uint8_t)(a - b);
 68 |       });
 69 |   };
 70 | 
 71 |   do_compare(pe1, pe2, peh1->OptionalHeader.SizeOfHeaders, 0);
 72 | 
 73 |   if (peh1->FileHeader.NumberOfSections != peh2->FileHeader.NumberOfSections)
 74 |   {
 75 |     fprintf(stderr, "Section count mismatch!!\n");
 76 |     return -8;
 77 |   }
 78 | 
 79 |   const auto section_count = peh1->FileHeader.NumberOfSections;
 80 |   const auto sections1 = (const IMAGE_SECTION_HEADER*)(peh1 + 1);
 81 |   const auto sections2 = (const IMAGE_SECTION_HEADER*)(peh2 + 1);
 82 | 
 83 |   for (size_t i = 0; i < section_count; ++i)
 84 |   {
 85 |     const auto& section1 = sections1[i];
 86 |     const auto& section2 = sections2[i];
 87 | 
 88 |     if (section1.VirtualAddress != section2.VirtualAddress)
 89 |     {
 90 |       fprintf(stderr, "Section VA mismatch!!\n");
 91 |       return -9;
 92 |     }
 93 | 
 94 |     const auto virtual_address = section1.VirtualAddress;
 95 | 
 96 |     if (section1.Misc.VirtualSize != section2.Misc.VirtualSize)
 97 |     {
 98 |       fprintf(stderr, "Section virtual size mismatch!!\n");
 99 |       return -10;
100 |     }
101 | 
102 |     const auto virtual_size = section2.Misc.VirtualSize;
103 | 
104 |     if (!section1.SizeOfRawData && !section2.SizeOfRawData)
105 |       continue;
106 | 
107 |     std::vector<uint8_t> section1_copy{ pe1 + section1.PointerToRawData, pe1 + section1.PointerToRawData + section1.SizeOfRawData };
108 |     std::vector<uint8_t> section2_copy{ pe2 + section2.PointerToRawData, pe2 + section2.PointerToRawData + section2.SizeOfRawData };
109 | 
110 |     section1_copy.resize(virtual_size);
111 |     section2_copy.resize(virtual_size);
112 | 
113 |     do_compare(section1_copy.data(), section2_copy.data(), virtual_size, virtual_address);
114 |   }
115 | 
116 |   const auto last_nonzero = std::find_if(out_file.rbegin(), out_file.rend(), [](uint8_t v) { return v != 0; });
117 |   if (last_nonzero == out_file.rend())
118 |   {
119 |     fprintf(stderr, "Warning: no differences!!\n");
120 |     out_file.clear();
121 |   }
122 |   else if (last_nonzero != out_file.rbegin())
123 |   {
124 |     out_file.erase(last_nonzero.base(), out_file.end());
125 |   }
126 |   
127 |   write_all(out_filename, out_file.data(), out_file.size());
128 | 
129 |   return 0;
130 | }
131 | 
132 | int main(int argc, char** argv)
133 | {
134 |   if (argc != 4)
135 |   {
136 |     fprintf(stderr, "Usage: %s <pe1> <pe2> <output (pe1 - pe2)>\n", argv[0]);
137 |     return -1;
138 |   }
139 | 
140 |   const auto pe1 = read_all(argv[1]);
141 |   const auto pe2 = read_all(argv[2]);
142 | 
143 |   if (pe1.size() < sizeof(IMAGE_DOS_HEADER) || pe2.size() < sizeof(IMAGE_DOS_HEADER))
144 |   {
145 |     fprintf(stderr, "Not a PE file!!\n");
146 |     return -2;
147 |   }
148 | 
149 |   const auto dosh1 = (const IMAGE_DOS_HEADER*)pe1.data();
150 |   const auto dosh2 = (const IMAGE_DOS_HEADER*)pe2.data();
151 | 
152 |   if (dosh1->e_magic != IMAGE_DOS_SIGNATURE || dosh2->e_magic != IMAGE_DOS_SIGNATURE)
153 |   {
154 |     fprintf(stderr, "Not a PE file!!\n");
155 |     return -3;
156 |   }
157 | 
158 |   const auto peh1 = (const IMAGE_NT_HEADERS*)(pe1.data() + dosh1->e_lfanew);
159 |   const auto peh2 = (const IMAGE_NT_HEADERS*)(pe2.data() + dosh2->e_lfanew);
160 | 
161 |   if (peh1->Signature != IMAGE_NT_SIGNATURE || peh2->Signature != IMAGE_NT_SIGNATURE)
162 |   {
163 |     fprintf(stderr, "Not a PE file!!\n");
164 |     return -4;
165 |   }
166 | 
167 |   if (peh1->OptionalHeader.Magic != peh2->OptionalHeader.Magic)
168 |   {
169 |     fprintf(stderr, "Bitness mismatch!!\n");
170 |     return -5;
171 |   }
172 | 
173 |   if (peh1->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR64_MAGIC)
174 |     return main2<true>(pe1.data(), pe2.data(), argv[3]);
175 |   if (peh1->OptionalHeader.Magic == IMAGE_NT_OPTIONAL_HDR32_MAGIC)
176 |     return main2<false>(pe1.data(), pe2.data(), argv[3]);
177 | 
178 |   fprintf(stderr, "Unsupported PE!!\n");
179 |   return -6;
180 | }
181 | 


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/PEDiffGen.vcxproj:
--------------------------------------------------------------------------------
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  2 | <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  3 |   <ItemGroup Label="ProjectConfigurations">
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  5 |       <Configuration>Debug</Configuration>
  6 |       <Platform>Win32</Platform>
  7 |     </ProjectConfiguration>
  8 |     <ProjectConfiguration Include="Release|Win32">
  9 |       <Configuration>Release</Configuration>
 10 |       <Platform>Win32</Platform>
 11 |     </ProjectConfiguration>
 12 |     <ProjectConfiguration Include="Debug|x64">
 13 |       <Configuration>Debug</Configuration>
 14 |       <Platform>x64</Platform>
 15 |     </ProjectConfiguration>
 16 |     <ProjectConfiguration Include="Release|x64">
 17 |       <Configuration>Release</Configuration>
 18 |       <Platform>x64</Platform>
 19 |     </ProjectConfiguration>
 20 |   </ItemGroup>
 21 |   <PropertyGroup Label="Globals">
 22 |     <VCProjectVersion>16.0</VCProjectVersion>
 23 |     <Keyword>Win32Proj</Keyword>
 24 |     <ProjectGuid>{3b8926be-360f-4644-bb53-dc76db4380b2}</ProjectGuid>
 25 |     <RootNamespace>PEDiffGen</RootNamespace>
 26 |     <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
 27 |   </PropertyGroup>
 28 |   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
 29 |   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
 30 |     <ConfigurationType>Application</ConfigurationType>
 31 |     <UseDebugLibraries>true</UseDebugLibraries>
 32 |     <PlatformToolset>v142</PlatformToolset>
 33 |     <CharacterSet>Unicode</CharacterSet>
 34 |   </PropertyGroup>
 35 |   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
 36 |     <ConfigurationType>Application</ConfigurationType>
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 38 |     <PlatformToolset>v142</PlatformToolset>
 39 |     <WholeProgramOptimization>true</WholeProgramOptimization>
 40 |     <CharacterSet>Unicode</CharacterSet>
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 42 |   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
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 46 |     <CharacterSet>Unicode</CharacterSet>
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 51 |     <PlatformToolset>v142</PlatformToolset>
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 53 |     <CharacterSet>Unicode</CharacterSet>
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 55 |   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
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 57 |   </ImportGroup>
 58 |   <ImportGroup Label="Shared">
 59 |   </ImportGroup>
 60 |   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
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 63 |   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
 64 |     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
 65 |   </ImportGroup>
 66 |   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
 67 |     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
 68 |   </ImportGroup>
 69 |   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
 70 |     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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--------------------------------------------------------------------------------
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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 <https://www.gnu.org/licenses/>.
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 |     <program>  Copyright (C) <year>  <name of author>
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 | <https://www.gnu.org/licenses/>.
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 | <https://www.gnu.org/licenses/why-not-lgpl.html>.
675 | 


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