"...What it comes down to is that when you purchase books in Kindle’s e-book format, they’re wrapped in DRM and are in a format that no other software can read. […] What happens to these e-books if Amazon, having lost money on the endeavor, stops producing Kindle readers a few years from now? What are the odds that these files will be readable 50 years from now? ..."
http://diveintomark.org/archives/2007/11/19/the-future-of-reading
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