CopyLeft. (also known as CopyTheft).
CopyLeft is a license to allow full free usage of code and ideas generated from any human being by other human beings.
In other words, you do not need any license or bound to any license.
- The consequence of you using copythefted and copylefted software is that, once you use it, all your software you develop should be accessed freely by the people who gave you the copythefted software. So, it is a very tight mutual engagement. Mutual openness is essential here.
The idea of CopyLeft is copythefted and suggested independently by Jong at around 1995, MRC, Hills Road, Cambridge. England in the context of biolicense.