7-Zip is open source software. Most of the source code is under the GNU LGPL 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.
*The main features of 7-Zip
*High compression ratio in 7z format with LZMA and LZMA2 compression
*Supported formats:
**Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
**Unpacking only: ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR and Z.
For ZIP and GZIP formats, 7-Zip provides a compression ratio that is 2-10
*Strong AES-256 encryption in 7z and ZIP formats
*Self-extracting capability for 7z format
*Integration with Windows Shell
*Powerful File Manager
*Powerful command line version
*Plugin for FAR Manager
*Localizations for 79 languages