How do I un-write protect a disc?

A friend downloaded a bunch of pictures onto a disc for me. Several of them need to be edited (flipped, etc.) However, it won’t let me modify the pics in any way.
It won’t let me save a copy to my hard drive.
I’ve tried sending a copy to my desk top. Still won’t let me modify.
It won’t even let me load them onto Face Book.

Since I started posting this question I learned that I CAN upload them to photobucket and modify / save them from there, but we’re talking about 200+ pictures.

There has to be an easier way!