This question is asked before a few times, with allot of answers. But since they where all in our Dutch forum I will shortly give you the answer.
Nothing is 100% secure! Even the best protected cd's (SafeDisk2) can be copied! There are tools to copyprotect your cd's but I think that someone that uses the right hardware and CloneCD can duplicate your cd's!
Maybe if you use our very own SEARCH function, you can find out more of it!
Good luck 2 U!