125 lines
4.2 KiB
Text
125 lines
4.2 KiB
Text
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7-Zip Extra 21.07
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-----------------
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7-Zip Extra is package of extra modules of 7-Zip.
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7-Zip Copyright (C) 1999-2021 Igor Pavlov.
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7-Zip is free software. Read License.txt for more information about license.
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Source code of binaries can be found at:
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http://www.7-zip.org/
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This package contains the following files:
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7za.exe - standalone console version of 7-Zip with reduced formats support.
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7za.dll - library for working with 7z archives
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7zxa.dll - library for extracting from 7z archives
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License.txt - license information
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readme.txt - this file
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Far\ - plugin for Far Manager
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x64\ - binaries for x64
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All 32-bit binaries can work in:
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Windows 2000 / 2003 / 2008 / XP / Vista / 7 / 8 / 10
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and in any Windows x64 version with WoW64 support.
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All x64 binaries can work in any Windows x64 version.
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All binaries use msvcrt.dll.
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7za.exe
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-------
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7za.exe - is a standalone console version of 7-Zip with reduced formats support.
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Extra: 7za.exe : support for only some formats of 7-Zip.
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7-Zip: 7z.exe with 7z.dll : support for all formats of 7-Zip.
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7za.exe and 7z.exe from 7-Zip have same command line interface.
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7za.exe doesn't use external DLL files.
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You can read Help File (7-zip.chm) from 7-Zip package for description
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of all commands and switches for 7za.exe and 7z.exe.
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7za.exe features:
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- High compression ratio in 7z format
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- Supported formats:
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- Packing / unpacking: 7z, xz, ZIP, GZIP, BZIP2 and TAR
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- Unpacking only: Z, lzma, CAB.
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- Highest compression ratio for ZIP and GZIP formats.
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- Fast compression and decompression
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- Strong AES-256 encryption in 7z and ZIP formats.
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Note: LZMA SDK contains 7zr.exe - more reduced version of 7za.exe.
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But you can use 7zr.exe as "public domain" code.
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DLL files
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---------
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7za.dll and 7zxa.dll are reduced versions of 7z.dll from 7-Zip.
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7za.dll and 7zxa.dll support only 7z format.
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Note: 7z.dll is main DLL file that works with all archive types in 7-Zip.
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7za.dll and 7zxa.dll support the following decoding methods:
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- LZMA, LZMA2, PPMD, BCJ, BCJ2, COPY, 7zAES, BZip2, Deflate.
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7za.dll also supports 7z encoding with the following encoding methods:
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- LZMA, LZMA2, PPMD, BCJ, BCJ2, COPY, 7zAES.
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7za.dll and 7zxa.dll work via COM interfaces.
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But these DLLs don't use standard COM interfaces for objects creating.
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Look also example code that calls DLL functions (in source code of 7-Zip):
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7zip\UI\Client7z
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Another example of binary that uses these interface is 7-Zip itself.
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The following binaries from 7-Zip use 7z.dll:
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- 7z.exe (console version)
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- 7zG.exe (GUI version)
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- 7zFM.exe (7-Zip File Manager)
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Note: The source code of LZMA SDK also contains the code for similar DLLs
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(DLLs without BZip2, Deflate support). And these files from LZMA SDK can be
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used as "public domain" code. If you use LZMA SDK files, you don't need to
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follow GNU LGPL rules, if you want to change the code.
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License FAQ
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-----------
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Can I use the EXE or DLL files from 7-Zip in a commercial application?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Yes, but you are required to specify in documentation for your application:
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(1) that you used parts of the 7-Zip program,
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(2) that 7-Zip is licensed under the GNU LGPL license and
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(3) you must give a link to www.7-zip.org, where the source code can be found.
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Can I use the source code of 7-Zip in a commercial application?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Since 7-Zip is licensed under the GNU LGPL you must follow the rules of that license.
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In brief, it means that any LGPL'ed code must remain licensed under the LGPL.
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For instance, you can change the code from 7-Zip or write a wrapper for some
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code from 7-Zip and compile it into a DLL; but, the source code of that DLL
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(including your modifications / additions / wrapper) must be licensed under
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the LGPL or GPL.
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Any other code in your application can be licensed as you wish. This scheme allows
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users and developers to change LGPL'ed code and recompile that DLL. That is the
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idea of free software. Read more here: http://www.gnu.org/.
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Note: You can look also LZMA SDK, which is available under a more liberal license.
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---
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End of document
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