pdf-signing

【文档与办公】Cryptographically sign PDFs (invoices, contracts, letters, forms) with open-source tooling — pyHanko applying a PAdES/eIDAS-aligned digital signature plus an optional visible signature panel. TRIGGER when the user asks to "digitally sign", "e-sign", "add a digital signature to", "sign this invoice/contract/PDF", "make a signed PDF", "certify a PDF", …

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