sorry i was in a hurry
ok, i will try to explain I backed my whole computer up onto about 6 different DVD's using winzip then I password protected it and then my friend (was my friend) took them and loaded it onto a computer of his and all he had to do was, disable autorun, closes password program, accesses CD via CMD..
But then I redid all of it using Winrar password protect program and no matter what whenever he tried to get into the disc it prompted for password...
PS- The program I posted above is way better...
Or get the free version of WinRAR
EDIT: to what you added, he wants to protect it and Winzip doesnt really protect it I bet my 5 YO brother could open it if it was protected with WinZIP, just because it is like a note that pops up and doesnt cause any changes