The analogue hole for books is so large that it would be futile to come out with an unbreakable DRM, even if it were theoretically possible. Back before Amazon opened their store, there was a thriving underground of people who would scan and format just about any book you might want. I'm sure there are still some who do that as a hobby. The hardware and software has improved greatly over the years.
I voted no, simply because I've seen too many stores close down over the years. I actually did purchase a number of books with Sony's LRF format, which I don't think was ever broken, mostly I suspect because the right people never bothered. Interestingly, Sony switched to a already broken scheme after a few years, which I think speaks volumes.
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