ok, thanks for the replies. Any books I got from the usenet I'm not bothered about and I'm more concerned about those that I have legitimately bought - which are the vast majority- but I take on board the advice about pirated books for the future. I think perhaps the answer by cybmole is relevant, I'm very new to the mac so I'll need to explore further, but even uploading a legitimately purchased book from my kindle to calibre on the mac results in a DRM locked message coming up when trying to view it.
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