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And prc was also used on Win CE and Symbian. There are two incompatible pdb formats for ebooks on Palm PDA, one was Mobipocket. Some ereader apps can read either. Earlier Palm OS PDAs don't have the Mobipocket application that can read .prc files, but only pdb.
Mobipocket was one of the original ebook sellers for Palm, Symbian, and Windows CE PDAs and smartphones long before the iPhone existed. In about 2005 Amazon bought Mobipocket (maybe same year Sony eInk came out, which used LRF?) and eventually changed to mobi (basic AZW was just Amazon version of DRM on mobi, because Mobipocket DRM was broken). The first Kindle came out in USA in Nov 2007. The iphone came out June 2007 in USA and when it got to Europe still had no copy/paste or 3G. At some stage Amazon killed their previous eBook format that they used before they bought Mobipocket. Later they ended mobi DRM support and eventually removed all the online Mobipocket apps and documentation, though other sites have copies.
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