lsnepomuceno/signet-pdf
Signet PDF is a Laravel package for digitally signing PDF documents. It provides a simple API for adding X.509 certificate signatures to existing or generated PDFs, helping PHP applications implement document authenticity, signature validation, and secure signing workflows with minimal setup.
Multiple digital signatures on a single PDF, in plain PHP. Each signature is appended as a new revision, so signing again never invalidates the ones before it. A1/x509 certificates, PAdES B-B to B-LTA, RFC 3161 timestamps, LTV and cryptographic validation. No framework.
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