Logo from The Castle Doctrine. Taken from its Steam store page. The game's author, Jason Rohrer, confirmed by email that the art assets (logos, etc.) are indeed under the same PD license (w:ticket:2016120910025281) as the game.
This work has been released into the public domain by its author, Tezero at English Wikipedia. This applies worldwide. In some countries this may not be legally possible; if so: Tezero grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse
Original upload log
The original description page was here. All following user names refer to en.wikipedia.