Definitions

1. noun

a type of license for software that allows users to freely distribute and modify the software, with the requirement that any derivative works must also be released under the same license

“The open-source software was released under a copyleft license, allowing users to modify and redistribute it freely.”

2. verb

to license software or other creative work under a copyleft agreement

“The programmer chose to copyleft his code, making it available for anyone to use and modify.”