copyleft
noun
Definitions
The philosophy of using copyrights to enforce freedom of information, especially software source code.
Example: They believe in copyleft because they want their software to be used freely by anyone.
A software license that follows this philosophy.
Example: I have placed my program under copyleft.
verb
Definitions
To license under a copyleft license.
Example: Linus Torvalds copylefted the Linux kernel.