Quote:
Originally Posted by kovidgoyal
calibre does not change checksums on add. The only exception to that is if you've installed third party plugins like DRM removal plugins.
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I'd forgotten about Alf, I don't need those any more so I'll disable them & retest
It was DRM, I just happened to grab a prc that I purchased from mobipocket so it had DRM, it was in a pile of 200+ prc's & mobi's of which no more than a dozen had DRM
The PDF came from the Boston Consulting Group website. AFAIK the stuff you download from their website isn't protected. I don't have an account at BCG and I certainly didn't pay them any money.
I just tested a prc & pdf from different sources and the checksums didn't change, I checked another BCG PDF and the checksum changed. so there's something in BCG pdf's that Alf thinks is DRM. So I disabled the two PDF related plugins, didn't need them any way and added the same BCG PDF - and the checksum didn't change.
The OP mentioned "a lot of PDFs", even if they weren't DRM'd they could be something like these I have from BCG which have something that apparently looks like DRM but isn't.
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