Most of the 7-Zip source code is under the LGPL-2.1-or-later license the unRAR code, however, is under the LGPL-2.1-or-later license with an "unRAR restriction", which states that developers are not permitted to use the code to reverse-engineer the RAR compression algorithm. The program can be used from a Windows graphical user interface that also features shell integration, from a Windows command-line interface as the command 7za.exe, and from POSIX systems as p7zip.
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7-Zip has its own archive format called 7z, but can read and write several others. It is developed by Igor Pavlov and was first released in 1999. LGPL-2.1-or-later with unRAR restriction / LZMA SDK in the public domain ħ-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". These translations are partial and for the user interface only.
7-Zip Overviewħ-Zip, like WinZip, creates a container called an archive that holds the files to be protected.
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Free Download 7-Zip full version - offline installer for Windows PC it is a file archiver with a high compression ratio.