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Digitally sign PDF files
In the application a user will upload a PDF file and then upload a personal signature created using a digital pen. How can I embed this signature in the pdf file?
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You cannot use multiple digital signatures, since later signatures will invalidate the previous signatures.
If you received a PDF digitally signed by others, you can sign it, but can't edit it. While signing a PDF, if the signer chooses to lock the document after signing, the document becomes read-only for everyone, including the signer.
Use a PDF editing library. I've used this one before: http://pdfsharp.com/PDFsharp/
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