A friend asked me to help her with an ebook she had purchased from which she could not copy any text. It was protected by DRM. It seems that printing it to another PDF file from Okular can do the trick. Don't ever do that, as it is illegal. I did not try to do it, of course. As well as I did not try to convert it to PS and then back to PDF, because it had never worked for me before with other kinds of restrictions. This is knowledge you should never acquire nor share with your followers.
@xiroux I hear the worst of it is the Apprentice Alf's DeDRM_tools!
It can be added as a calibre plugin - so check your plugins to make sure you're safe! It should never be used, as it can break all kinds of DRM from epub, pdf and even mobi... and who knows what this can lead to‽
Stay clear from Apprentice Alf, Apprentice Harper...and any other apprentices, just to be safe!
@xiroux I, too, would like to formally register my objection to this practice. Despite almost all DRM systems falling back to open systems very early on in their pipeline (usually well before the font rendering stage, and almost never afterwards), usually in ways that can be hooked with basic debugger skills – even when the DRM software itself doesn't provide a way to easily bypass the ethically-mandated rights protection, as in your case – it is your moral obligation not to do so.
Don't tell anybody they could published books without DRM or formerly protected by DRM on the internets Genesis Library for no cost. This could hurt the industry living of selling us good backup solutions for our valuable DRM protected public knowledge. Not to think of how harmful this could be in case of a publisher or DRM provider shutting down their well respected services.
@xiroux Never heard about this DRM thingy, probably because it is soooooo easy to use that it blends in to the background and does not cause aaaaany problems whatsoever.
Merveilles is a community project aimed at the establishment of new ways of speaking, seeing and organizing information — A culture that seeks augmentation through the arts of engineering and design. A warm welcome to any like-minded people who feel these ideals resonate with them.