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Kindle Is Making It Harder to Switch to Rival eReader Brands.
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
Unfortunately currently broken for the latest version of Kindle for PC, which switched to a different encryption scheme. It also uses KFX file format that nobody likes, which fortunately can be converted to EPUB with another plugin, but de-DRMing doesn't seem to work right now. It still seems to work for titles in AZW3/MOBI that didn't get DRM update or didn't have DRM in the first place.