WHy the HELL would you need to CRACK an OPEN SOURCE SCRIPT, Jaime? See? Gimmicks? Open source my ass. It's not open source - you hard Selling it - for money or not - under that labeling. If it CAN be cracked, it is NOT open source. Irregardless - be that the case - dude - you should make it so that any missing or messed-with bytes trigger trojan farms hahahahaha
I vote this the worst post I've ever read on any open forum. You should truly be ashamed, and stop taking payments for posts like this. The script is going to be open source, the only part that is not is the 'domain lock', thus to stop those with corrupt minds passing around the script to use on any domain they wish.