copying off of bad dvd=r

[Dsquorpion]

i have ran into a problem with princo dvd-r. i think they are suffering from rot after only 3 months, i am having to recopy them to riteks, and some of the princo disks have seem to caused some vob files to become bad, i have used decrypter, nero disk copy option, and record now max to try and make an image,
nothing works,

has anyone ran into rotting copy's of princos,
and have u been able to recopy them somehow

[setarip]

Why don't you simply once again make copies from the ORIGINAL DVDs that you own?