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There have been additional third-party attempts at writing more concrete documentation based on the released code. The specification can be found in plain text format in the 'doc' sub-directory of the source code distribution. The official, informal 7z file format specification is distributed with 7-Zip's source code since 2015. The latest stable version of 7-Zip and LZMA SDK is version 22.01. The LZMA SDK 4.62 was placed in the public domain in December 2008. The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License. The 7z format initially appeared as implemented by the 7-Zip archiver.
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Yes: GNU Lesser General Public License / Public domainħz is a compressed archive file format that supports several different data compression, encryption and pre-processing algorithms.
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