Problem backing up old DVD's

I have some old DVD’s that I have had for a long time, and would like to back them up before it’s too late. My problem is that they still play fine, but won’t copy. I get read errors during the copy. I have tried DVDShrink, CloneDVD2 and DVDmate. What is the best software to try and salvage these old movies? thanks

Try to create an image throught DVD Decrypter, then mount it and back it up. Use low read speeds.