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As the book industry attempts to move from hardbacks to downloads, booksellers and publishers are struggling to prevent readers from pirating eBooks the way some music fans pirate music.
On the front line of that effort is digital rights management technology, or DRM, that is embedded into eBook files. DRM lets the companies control how copies can be made of eBooks and which devices can display them. But some users say DRM also prevents them from reading the eBooks they've bought.