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The file must start with %PDF-1.0 to %PDF-1.7 and an end-of-line marker, followed by a comment of % and four bytes above 127. A document whose next save is a full rewrite is judged by the header that save writes. Save as PDF/A makes the next save full, at version 1.7 when the kept version isn't 1.0 to 1.7. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Pq7HyDBXygTf7jcqdsjcfn