by Trixie Clark, Edudemic
Visit this article for a brief review of the most popular eBook formats. One thing that an e-book user should know is that formats can be unprotected or protected by a digital rights management (DRM) wrapper. The DRM, which is used as an anti-piracy tool to protect authors, can prevent you from opening an e-book file even if the format is compatible with your reader.
http://edudemic.com/2013/03/most-popular-ebook-formats/
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