How to unlock a game swf from a website and put it on your own?

Well i have a game website and people are requesting games from coolmath and xgen, well i download the swf files then uploaded to my website and it wont play, it will say something like Game over, this gamehas been pirated from xgenstudios blah, blah...... how do I unlock it and put it on my website, ( Im not trying to commit copyright infringement by the waY)