Create digital signatures for PDF documents with PHP


Digital sign PDF documents with PHP

Document Level Timestamp

This demo adds document level timestamp (PDF 2.0) to a PDF document.

A document level timestamp establishes the exact contents of the complete PDF file at the time indicated by the time stamp. The timestamp signature is created by an external time stamp server, so no signature process is done locally. The communication between the component and the timestamp server conforms to RFC 3161.

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Time stamp server: