This blu-ray includes a code to redeem a digital copy through ultraviolet. This is normal. Unusually, however, the redemption process lets you do two things:
1. Register your movie with ultraviolet, which links with your ultraviolet account and lets you stream it through vudu.
2. Get a $14.99 credit to the Amazon instant video store! you are theoretically supposed to spend this on buying the same movie, but there are no restrictions.
Effectively, in addition to your blu-ray and DVD, you are getting BOTH a streaming copy through vudu AND a $15 Amazon instant video credit, all for $24 (the current cost of this blu-ray).