Exactly, "copyright infringers" is indeed the most accurate "Legal" term. The type of "Copyright Infringement", in this particular case, is the act of taking (stealing) a copy of a game that does not belong to you. It describes a form of theft. If you have a copy of a full video game installed on your PC that you did not pay for, win in a prize or something, and fair usage rights don't apply in your situation, and you did not get the copyright owner's permission to take that copy, then you stole it. It doesn't matter whether or not you took the copy from a high street shop or you took it from cyberspace, you stole it. You took something that doesn't and shouldn't belong to you.