Queen Tess makes a good point, however its not real dificult to strip DRM from an ebook. My recommendation is to look at the methods that Blockbuster and Nuvu are using for this problem. Both companies will let you download a movie for a certain period of time then its eliminated from your collection. Trouble is that Nuvu and Blockbuster are renting per movie and you are renting per month so Nuvu and Blockbuster's modles need to be adapted for your use.
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