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You've all heard "this game is a rip-off of that game" before and most of the time it's just a silly argument with no basis.
However in Perpetuum's case, how are they not being sued by CCP? I was in beta and not only was almost the entire GUI taken directly from eve, they had the SAME EXACT symbols for the buttons! There's a difference between being "inspired" by and just plain ripping off. I felt like I was playing eve. It's like that case where white wolf sued sony pictures for making Underworld. They listed hundreds of exact instances where that movie was a total rip off of world of darkness. CCP could do the same thing.
I don't know if the game is any good or not, but if you're going to steal a GUI, at least have the decency to move it around a bit and for Crom's sake make your own graphics!