Quote:
Originally Posted by Justin Nemo
Perhaps we're talking at cross purposes again.
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We are indeed. The PDFs you're using do technically have DRM (in that they, as you say, prevent certain uses, e.g. printing).
But these limits only apply when used with software that obeys them. There's no actual encryption of the PDF contents, only some extra metadata asking the viewing program not to allow certain things.
Since the PDF can be read without a password, calibre can convert it to some other format.
I must admit that I don't often use PDFs, and I'd forgotten that this limited form of password-protected DRM was possible.
So, let me be a little more precise in my language.
Calibre does not contain any code that circumvents DRM that effectively controls access to the content of ebooks.