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Here's an idea for DRM. It's also physically based:
When you want to buy the ebook, you simply go to the store and purchase an analog text-transfer medium - Prepared Analog Pulp-based Electronic Reader. Then you feed the medium into the ebook kiosk, which downloads the text and writes it to the medium, in a way that's very hard to digitally copy. Almost entirely secure, in fact. The benefits of this method are that it's device independent, doesn't require any special software, and is very close to immune from copying.
;-)
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