I bought 2 used movies from Blockbuster and want to back them up. I am using dvd shrink 2.3 to burn the disk to my harddrive. After its done burning I try to play it and there is no audio. Is this something to do with a copyright issue? I have burned other dvd's and they turned out fine. I am doing the same process that I always have. What could be the problem? If anybody can help me that would be great.Thanks.