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The BFG edition (which includes Doom 3 , Resurrection of Evil , and The Lost Mission ) generally does not have this error because it uses Steam or GOG DRM. However, if you get "Invalid CD Key" on BFG:
If you’re 100% sure your key is correct and legit: doom 3 cd key invalid
The Doom community is legendary. They have reverse-engineered the engine to remove all DRM, improve graphics, and fix bugs. These are ; they require the original game assets. The BFG edition (which includes Doom 3 ,