You could write a Snood style game with Bejewelled's jewels. Would that be ok? This is where it gets into a grey area. The EULA for Age Of Empires 3 doesn't place any restrictions of a time period or limited use. Does that mean, according to your belief, using their data would be legal? After all you have been granted a license to use that data and it's entirely up to you how you use it. Even Popcap's license isn't clear... The question is when does the trial period expire? If the game has a 60 minute trial period does that mean 60 minutes on your drive while not being run? Obviously not. So you could argue the trial doesn't count down unless the exe is run. If you're not running the exe then the trial doesn't expire therefore you don't break the terms of the license.