KGB Archiver [SEP] license
General Public License. Version 2 beta 2 is available for Microsoft Windows and a command-line version of KGB Archiver 1.0 is available for Unix-like operating systems. 
Features.
- Native .kgb files and .zip files
- AES-256 encryption
- Creating self-extracting archives
- Unicode support in both the user interface and file system interactions
- Shell extension for Windows
System requirements.
The minimum requirements for running KGB Archiver are:
- 1.5 GHz processor
- 256 MB RAM
See
KGB Archiver
KGB Archiver is a discontinued file archiver and data compression utility that employs the PAQ6 compression algorithm. Written in Visual C++ by Tomasz Pawlak, KGB Archiver is designed to achieve a very high compression ratio. It has ten levels of compression, from very weak to maximum. However, at higher compression levels, the time required to compress a file increases significantly. As a consequence, the program uses memory and CPU intensively.
KGB Archiver is free and open-source, released under the terms of the GNU