This was in the
FAQ about copying to a DVD:
QUOTE
Can I make a DVD from my Amazon Unbox downloads?
You can store your downloaded files on a DVD or other removable computer storage device for the purpose of backup in the same format as the original files. However, any DVDs that you burn with Amazon Unbox files will not be readable by a DVD player. You can only view the files using Amazon Unbox installed on the computer that originally received the downloads..