Nico Weber 281e3158c0 LibPDF: Some preparatory work for AESV3 ...

This detects AESV3, and copies over the spec comments explaining what
needs to be done, but doesn't actually do it yet.

AESV3 is technically PDF 2.0-only, but
https://cipa.jp/std/documents/download_e.html?CIPA_DC-007-2021_E has a
1.7 PDF that uses it.

Previously we'd claim that we need a password to decrypt it.
Now, we cleanly crash with a TODO() \o/

2023-07-14 06:34:03 +02:00

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