Ability to filter those out with proprietary artwork or other restrictions

Created by: Trilarion

All of the entries have free code, but many do not have free content also. Have an option to filter it out. Look for example at https://libregamewiki.org/Libregamewiki:Rejected_games_list.

Either it could be based on a existing keyword (requires proprietary content) = blacklisting or on absence of free assets license = whitelisting.