All digital copies have an expiration date
Tho I have found on almost 90% of them they still work, the other 5% if you keep at it then they will work
Only one that won't work and keeps giving me its expired coupon is, Watchmen which isn't really that great of a movie
if you have a blu ray player then digital copies really look like crap. I was watching Wall-e on blu ray and then did the picture difference on my macbook pro and I can say the digital copy looks awful but maybe on my iphone it won't.