If any are gotten wrong, which is likely without a way to test them properly, Amazon would immediately use that one for now and then keep adding more new ones over time.Įven if someone managed to get all of the algorithms correct, DRM removal would only work until Amazon deployed software with more new algorithms and blocked downloads to the older software. In order to defeat KFX DRM in DeDRM all of the thirty or so remaining DRM algorithms would need to be reverse engineered. Making it known to the world would just result in Amazon switching to V12, causing all of that hard work to be for nothing. Keeping it quiet would mean that at least they could make use of it. You'll also find a nice (de-DRMed I think) '. Amazon is currently using V11, which DeDRM attempts to decrypt but does not do correctly.Īs things stand now anyone who does figure out how to defeat the current V11 DRM has a strong incentive to keep it to themself. Your ebook PDF is now located in your 'Calibre Library' folder here: 'C:\Users\YOURUSERNAME\Documents\Calibre Library\EBOOKAUTHOR\EBOOKTITLE\EBOOKTITLE.pdf'. To get the books off the tablet I have to use a file manager on the tablet to copy them from internal storage to the SD card (I just copied the folder where Kindle saves the books). They are built into the various Kindle apps and device firmware as highly obfuscated code.Įach algorithm is identified with the letter V followed by a number. Download a few books, pull the backup, then use that file in the DeDRM plugin in Calibre to get the Kindle key from the old app. Amazon has implemented around 40 different DRM algorithms for KFX.
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