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This package can sign PDF documents with a valid x509 certificate.
It can use an x509 digital certificate file in PFX format either from a local or an upload file.
The package can take a PDF document and change the document to add a digital signature with the x509 certificate.
|PDF is a popular format for generating documents that users can view or print.
Anybody can alter a PDF document using editing tools. In some cases, the original author does not want that the document is changed.
Certificates can be used by the PDF document author to digitally sign a document to assure that the original document is intact when the users view it.
The PDF document viewer programs can check the digital signature contained in a document to verify if it is still intact.
This package provides a pure PHP solution to sign existing PDF documents with x509 digital signatures.
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