Permissive licenses are open source licenses, like copyleft. In contrast to copyleft licenses, permissive licenses have hardly any restrictions with regard to the further development and distribution of the free software
. The further developed software can be distributed under any license conditions, the source code
doesnot have to be made accessible. These regulations mean that permissive software can be implemented in products in compliance with the specified conditions.
Well-known examples of permissive licenses are Apache License 2.0, MIT and BSD licenses, Berkeley Software Distribution (BSD).