When software use licences were a new thing, the big phrase in many of them were, "as a book, like a book." Said printed book can NOT be in two places at the same time, and can NOT be READ by two people in two different places at the same time. Depending on the EULA, some actualy allow you to install the software on two different machines, but that applies primarily to business use software. (Microsoft Office was one of the first to do this.) This allowed the guy that uses Office at work to install it on his home machine as well so that he doesn't need to buy two copies of the software to work on one project. It is also outlined that the machine it's installed on at work MUST be his personal machine, and NOT used by others in his absense. Where ANY game is concerned, however, there is no real reason to incorperate this type of licence. In other words, "What Taxman said." lol
This is definately NOT legal.