Originally Posted by Billi
With Amazon it's clear, they just took what Mobipocket had developed, but the question was why all epub publishers rely on Adobe.
Owly, maybe they just did it, were there at the right time and offered a solution.
Because they created the system and were successful at licensing it. The system includes the servers and the generation of the encryption keys and registration etc.
The reason is they were trying to dominate the document market - pdf's etc.
we're down the road a bit from all that.