copyleft

The philosophy of using copyrights to enforce freedom of information, especially software source code.

They believe in copyleft because they want their software to be used freely by anyone.

A software license that follows this philosophy.

I have placed my program under copyleft.

The GNU General Public License is a copyleft licence.

To license under a copyleft license.

Linus Torvalds copylefted the Linux kernel.