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We wanted to test with 1.26 because that version will still download e-books using voucher envelope versions 2 or 3, which the latest tools will decrypt. Version 4 was implemented in K4PC/MAC 1.27 and cannot be decrypted by the latest tools. The book page on Amazon for these books contains a warning that the latest version is required, with further details saying 1.26 and above. It seems Amazon is yet to update this information, and will only allow the download of these Pearson textbooks using v4 voucher envelope, which is not supported by 1.26. The web page information should not now state that 1.26 is supported.
The best chance for anyone to decrypt these books is to download a copy in 1.27 or 1.28 now and keep it safe in the hope that the tools will later support decryption of v4.
Failing this there is an outside chance that Apprentice Sakuya’s patch to 1.28 will get a kf8 version of these books, but I would not be holding my breath!
Last edited by darryl; 06-22-2020 at 11:10 PM.
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