Public bug reported:

Binary package hint: pdfcrack

The pdf encryption key only depends on the user password (and information that 
is stored in the file, like the hash of the owner pwd.)
e.g. see http://www.cs.cmu.edu/~dst/Adobe/Gallery/anon21jul01-pdf-encryption.txt

 If it's not illegal[1], pdfcrack should point out that if you don't
need a password to view the pdf, it can be completely decrypted by e.g.
pdftk with the password checking commented out.  Enforcing the owner
password in PDF encryption is entirely optional, in a technical sense.
The legal sense is another matter, and even talking about things, let
alone distributing software that ignores restrictions, might be illegal
in some parts of the world.

 I wish I'd known this;  I wouldn't have tried pdfcrack, since I just
want to merge some user pass="" PDFs.

[1] DMCA in the US, and all those garbage laws spreading to other
countries too.

** Affects: pdfcrack (Ubuntu)
     Importance: Undecided
         Status: New

-- 
pdfcrack description/docs should mention other ways to access pdfs
https://bugs.launchpad.net/bugs/224562
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