I have a PDF whose core details need correcting without breaking its existing PKCS#7 signature. Specifically, I want the Author, Title and Keywords fields revised, and the document’s Creation Date/Time aligned precisely with the timestamp already embedded in the signature. The signature itself must stay intact and verifiably authentic after your changes—no re-signing. Key points • Update metadata: Author, Title, Keywords. • Adjust the CreationDate so it matches the signature time. • Keep the current PKCS#7 signature valid; the hash and integrity checks must still pass once the file is opened in any standard PDF viewer or signature-verification tool. Deliverable • The amended PDF, fully validated with its original signature. • A short note (or script, if you automate the task) outlining the steps or tooling you used, so I can reproduce the process later if needed. Any reliable method is fine—command-line utilities (e.g., iText, QPDF), low-level manual editing, or a custom script—so long as the end result meets the criteria above. If you’ve handled similar metadata tweaks on signed PDFs before, I’d love to hear about it.