Check license information here: 7-Zip license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Most of the source code is under the GNU LGPL license. The program supports 7z, XZ, BZIP2, GZIP, TAR, ZIP, WIM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z.
7-Zip is a open source file archiver with a high compression ratio.
