Hi there! I recently purchased a used copy of LOTR: Fellowship. The four disc, more stuff then you can possibly care about, set. While I was backing up the second disc with both Dvd Decrypter and Dvd Shrink I came across an error near the end of the disc. When I checked the disc to see if it needed cleaning, I noticed a streak of discolouration on the film. I remember seeing this before on one of my other dvds but I've never come across any problems prior to this. Could this be giving me the errors or is it something else? Was the disc poorly pressed or can this occur over time?