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7-Zip is open source software. Most of the source code is under the GNU LGPL license. The AES code is under a BSD LICENSE. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.

You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip. But you can make a donation to support further development of 7-Zip.

The main features of 7-Zip

* High compression ratio in new 7z format with LZMA compression

* Supported formats:

o Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR

o Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB and NSIS

* For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip

* Self-extracting capability for 7z format

* Integration with Windows Shell

* Powerful File Manager

* Powerful command line version

* Plugin for FAR Manager

* Localizations for 63 languages

http://www.7-zip.org/" target="_blank">wincert-homepage-button.png

Download 7-Zip 4.54 beta (2007-09-04) for Windows:

Download .exe 32-bit 838 KB

Download .msi x64 1100 KB

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