Howcome i can play crysis 2 without the disc but i cant play mass effect 2 without the disc?

i can just click crysis and it plays but mass effect 2 it says need the disc. how do i make my games to run without the disc? please teach me.Howcome i can play crysis 2 without the disc but i cant play mass effect 2 without the disc?
I have the same issue haha it could be something about the copyright that allows Crysis 2 to do that and not Mass Effect 2 but honestly not really sureHowcome i can play crysis 2 without the disc but i cant play mass effect 2 without the disc?
Each developer chooses their own copy protection. Mass Effect 2 can still be played without the disc if you register your copy to Origin and download the digital version. There are also cracks but those are in violation of the license agreement.Howcome i can play crysis 2 without the disc but i cant play mass effect 2 without the disc?
I faced this problem. But can't find solution