Quote:
Originally Posted by scottt
My experience with free books from Amazon has been that they do not have any encryption on them at all.
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There isn't necessarily a linkage between free and DRM-free in the Kindle Store. Sometimes a DRMed ebook is free as a promotion, e.g. the first in a series. Many of the AZW's produced by Amazon's DTP service (typically small publishers and ebooks direct from authors) are DRM-free, and these are usually relatively low cost but not typically free.
On the Kindle Store web page for DRM-free ebooks, under product details, there should be Simulataneous Device Usage: Unlimited.
As others have said, if and AZW is DRM-free then the original .prc will work "as is" with any MOBI reader (or Calibre). I typically make a copy in a different directory with extension .mobi, but this isn't absolutely necessary.