Issue #3584726 by joshuami: PDFs with /Encrypt dictionary fail to parse.

Joshua Mitchellrequested to merge
issue/pdfa11y-3584726:3584726-pdfs-with-encrypt into 1.0.x

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

Closes #3584726

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