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As long as you still have a devise the books work on, and have them backed up to something (a memory card for instance) that will always work with it, and the devise continues to work, won't your books be good for a long time? Also, with technology progressing, in the future, can't we just reformat the books we own to be used on the currant technology? Wouldn't Sony later, update the books we've bought like they've done this time with the epub change?
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