Used to work for them, the source has been leaked many times but the ones that are leaked have several easy to abuse exploits that would allow people to gain full access over your website and user database, wouldn't recommend using them. -- also fk that business, lost so much money from PayPal and shit, the only full proof thing was bitcoin but noone ever was willing to buy with it.
If you want though I can get you in contact with the owner, if you give him the right price he'll might sell the whole thing to you.