Quote:
Originally Posted by AMacD
As far as I know, all *.prc are DRM free but *.mobi can be protected or unprotected. Also *.azw files can be protected or not.
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The .prc and .mobi filename extensions can be used interchangeably, and both can be DRM-ridden or DRM-free. Any MOBI that costs money from mobipocket.com has DRM (publishers have no choice, it must have DRM) and many of the Kindle AZW ebooks are MOBIs from mobipocket.com. For Kindle AZW ebooks submitted via Amazon's DTP, the default is DRM-free but they can also have DRM if the publisher/author uploads a DRMed MOBI.