Digital signature on PDF file from C#

I want to add digital signature on PDF file from C# code. I understand from web that there are some third party license required, or I would need to use Adobe Acrobat to apply digital signature on PDF using acrobat APIs.
What is the licensing mechanisim for acrobat is APIs? What is the cost effective way for applying digital signature on PDF files.

Hi,  Use C# to create signature on PDF. You can refer to my link http://www.e-iceblue.com/Knowledgebase/Spire.PDF/Program-Guide/How-to-Create-PDF-Digital-S ignature.html

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    If you're using Adobe Acrobat then refer the below links:
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    Document : http://help.adobe.com/en_US/acrobat/X/standard/using/WSAC8084C2-14F7-4 841-9EF8-92106D22C3DB.w.html
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    Hi,
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    Link:[http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/e0fbaa71-cd8d-2910-5982-e30626035400]
    Link:[http://help.sap.com/saphelp_nw70/helpdata/en/18/ecb69017ad4765855425b97f666470/content.htm]
    Link:[http://www.sapfans.com/forums/viewtopic.php?f=13&t=346498]
    Link:[http://www.saptechies.com/digital-signature-for-form-16/]
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