Copyleft

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Copyleft symbol used under copyleft. Click on file description for attribution page that is mirrored from the Wikimedia Commons

Copyleft is a licensing style where much of that which is or can be protected under copyright is given to the users, hence the term in Finnish is fi."käyttäjänoikeus" == en."user's right".

It was first popular in free software but has since expanded to include various other types of works of art or utility, most known of which is of course the Wikipedia.

Most known GNU copyleft licenses are GPL for code and GFDL for other written works

Another famous family of copyleft licenses is the Creative Commons