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Content Encryption: the content of your ebook is encrypted. This means that the source content does not appear as clear text and cannot be displayed or copied by a third-party software. It can however be opened in the Mobipocket Reader by any user
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Exactly what i want to say.
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I have never seen a "Content Encryption" MOBI so far as I know
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I upload a "content encrypted" file. Do not care about languages, it is written in Vietnamese.
To know what kind of content encryption in a prc file, please open it in Mobireader, select propertise and summary tab, then find encryption label. You will see Content Encrypted (if Content Encryption with DRM it will be PID Encrypted).
I see a lot of content encrypted files which are only opened in Mobireader, and i am so surpprise that you never see it.
Thus, the question: "how to open these content encrypted files in another third-party software". In my case, i need to open them in calibre to convert them into lrf and put them in my Sony Readẻ