adding signature in a pdf file [duplicate]

This question already has answers here: Closed 10 years ago.

Possible Duplicate:

Adding a digital signature to a pdf file

1). user will upload a pdf file 2). and then will upload his signatures 3). embed the sig开发者_运维技巧nature in pdf file

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You are going to need a PDF editing library. I've used PDFSharp in the past and it works well. http://pdfsharp.com/PDFsharp/