Simplify the following text for a Grade 10 native English-speaking person.
Original: A number of users have chosen to release their contributions under the Creative Commons Attribution Share-Alike license ( known as `` CC-by-sa '' ) , or some other license , or even to release their contributions into the public domain .
Simplified: A number of users have chosen to release their contributions under some other license , or even to release their contributions into the public domain .