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Old 09-03-2012, 06:03 AM   #13
BetterRed
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Posts: 21,836
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Join Date: Mar 2012
Location: Sydney Australia
Device: none
Quote:
Originally Posted by kovidgoyal View Post
calibre does not change checksums on add. The only exception to that is if you've installed third party plugins like DRM removal plugins.
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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Last edited by BetterRed; 09-03-2012 at 07:02 AM.
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