Iron Maiden has no true claim to the name iron maiden, ions, or maidens. if their inspiration comes from a torture device, it has nothing to do with a maiden with a will of iron, or in this case a maiden whose ions are out of control. If 3D Realms had used their exact font, music, Eddie, or any ACTUAL intellectual property created by the band instead then it would be justified. This is a classic case of a record company wanting every dime possible to further their corporatism. I find it hilarious the band, or most likely the record company, would even do this when they themselves experienced the same exact thing with author Frank Herbert who refused to let them use the name Dune in one of their songs tributing the book and story and so they changed it from Dune to "To Tame A Land". I hope Ion Maiden pokes and jabs the band in the game calling them middle aged "rockers" past their prime clinging to relevancy and needing cash to pay their rent.
I find it funny that they or any other band didn't attack Id Software when Doom I&II used their songs for their game(even if the songs are tweaked)