Well hate to tell you this but this one one of the reasons that its protected, to keep people from ripping them, etc.
It is rightfully yours though and your allowed to copy, in which you could probably burn to back up with no problems. Its just going to be hard for you to rip the cd most likely at this time.
Probably your best bet is to search around, see if anyone else has created a tool to get around this. Unfortunately though, being at this site in public view, I can't be in so declined to tell you how to crack your cd to be able to rip. (Even if I did know how, I most likely wouldn't post it on a public forum in which I should also have to mention to others not to do on this site as well.)
Regards and good luck.