>I'm not sure how you calculate the sha1 hash.

I'm using openssl sha1 <<file>>.

>But usually it's calculated from the data fork content. That changes 
>when you save embedded notes, but not when you save just as PDF 
>(i.e. not embedded or without notes). (Unless you've converted 
>notes.)

Yes, that's what I'm seeing. The odd thing is that if one takes, say, 
an rtf and calculates a hash, edits, saves (yielding a different 
hash), and undoes the edit, the hash is restored to the original 
value. But the corresponding process with a pdf (adding a Skim note, 
embedding, and removing) doesn't restore the hash. It's as if the 
process of editing leaves a "residue".

If it's not restored to the original value, it's missed as a 
duplicate when I use, say FileBuddy or EagleFiler. My tentative 
solution is to rely on other metadata to identify possible duplicates.

humanengr

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