OpenTTD has had entirely their own assets for 15 years.
But OpenTTD itself isn't a clean-room implementation of the game, it's a branch off a decompilation of the original game.
If Atari was really out to copyright the project into oblivion, they're likely to succeed in a legal sense*.
Within the confines of the current laws and known history of the game, and being a fan of both works, I think this compromise is fair.
*NotALawyerClause
alt Hacker News
But OpenTTD itself isn't a clean-room implementation of the game, it's a branch off a decompilation of the original game.
If Atari was really out to copyright the project into oblivion, they're likely to succeed in a legal sense*.
Within the confines of the current laws and known history of the game, and being a fan of both works, I think this compromise is fair.
*NotALawyerClause