Problems with DVD decrypter

I have no problems with decrypting dvd’s when i use dvd decrypter. But when :a i have burned my knew copy i have a problem. When i want to rip that copy i get errors. And the decrypter cant go on. There are no scratches on the surface of the dvd. Some say it depends on the media but the problem is also know with A-Brands like tdk. Some say it depends on the hardware. But different burners have the same problem. Who knows what the real problem is. :wink: