" The GPL grants the recipients of a computer program the following rights, or "freedoms":

• to run the program, for any purpose

• to study how the program works, and modify it

• to redistribute copies
• to improve the program, and release the improvements to the public

In contrast, the end-user licenses that come with proprietary software rarely grant the end-user any rights, other than the right to use the software, although it is debatable whether one requires a license for use per se. It may even attempt to restrict activities normally permitted by law, such as reverse engineering

The GPL seeks to ensure that the above freedoms are preserved in copies and in derivative works. It does this using a legal mechanism known as copyleft, which requires derivative works of GPL-licensed programs to also be licensed under the GPL

The GPL is the single most popular license for free and open source software. As of April 2004, the GPL accounted for nearly 75% of the 23,479 free-software projects listed on Freshmeat, and about 68% of the projects listed on SourceForge

Prominent free software programs licensed under the GPL include the Linux kernel, the GNU Compiler Collection, and Perl. "

Bika at Sourceforge

Bika gratefully hosts downloads and support at SourceForge.net,  the world's largest development and download repository of Open Source code and applications

The Bika Sourceforge project features pages for downloading the latest releases and documentation, issue trackers for bugs and solutions, technical issues, patches and feature requests. Forums and mailing lists are available for developers and users to discuss Bika topics

Bika at Sourceforge