would it be legal to do this.
Legal? Maybe, depends on which country you live in. However, be advised that doing so may potentially get BlitzLockIT (and programs that use it) flaged as trojans or virii. As a general rule of thumb, you should not put destructive code in your software. Ever.Oh and by the way, you can't disable someone elses software until he's used your program. Once he finds out what it does to his tools, he'll undo it, and crack your software anyway. And besides many of the tools "crackers" use are legit, valid debugging programs. Disabling them could get you in serious trouble! If someone at nVidia wants to play a Blitz game and you disable his debugging software, you might get a hefty lawsuit comming your way.