The M-Disc claims 1,000 year permanency.
 
http://www.mdisc.com/
 Anyone have experience with these?
 --Chuck
 (wondering if we'll be able to find a 1,000 year old DVD player) 
forget it there is no way you'll be able to play anything digital in a 1,000 years
because of Digital obsolescence[1] and add copyrights
the best example is the BBC Domesday Project[2]
[1]