A DivX Vid

I burned a Vid on a DVD-R watched it on a standalone dvd player and it played blocky on one bit i rewound it back to that bit and it was fine after and didnt go blocky again.
If i wait for a year and it plays blocky no matter what i play it on will copying it back to the pc always sort the issue out or does it work like this: If it becomes so damaged even copying it back the file will be freezy then?

The problem is with the DVD player, and how it handles the codec. I highly doubt that you will have problems to read and copy the video from the DVD at a later time unless the disk becomes damaged or dirty.