[2] In several of the cases listed here, the game's developers released the source code expressly to prevent their work from becoming lost.
Some developers that have released their source code have concluded that, in general terms, such action has not been harmful and even beneficial, among them Alec Holowka (Aquaria), Adam Saltsman (Canabalt),[3] John Carmack (Wolfenstein 3D, Doom, Quake),[4] Brian Hook (Quake II),[5] and Terry Cavanagh (VVVVVV).
Only the game engines in this table are developed under an open-source license, which means that the reuse and modification of only the code is permitted.
If the source code is given out without specified license or public domain waiver it has legally to be considered as still proprietary due to the Berne Convention.
If the source code is given out without specified license or public domain waiver it has legally to be considered as still proprietary due to the Berne Convention.