Adobe® Certified Document Signing
Adobe Certified Document Signing allows authors to create Adobe® PDF files that clearly certify to recipients that the author's identity has
been verified by a trusted organization and that the document has not been altered. The solution allows organizations to engage in more secure
and reliable electronic document exchange.
See an example of work a digital signature to pdf document 
Adobe® Acrobat Security Demo
True Credentials® for Adobe® Acrobat®
Designed for Enterprises
GeoTrust’s True Credentials® for Adobe® Acrobat® is changing the way enterprises use and trust electronic information.
True Credentials for Adobe Acrobat is available to in two hardware configurations – server-based or token-based – to meet varying volume
requirements.
My Credential™ for Adobe® Acrobat®
Designed for Individuals
GeoTrust's My Credential for Adobe Acrobat changes the way recipients can trust your documents and electronic information.
This client-based solution is designed for desktop-based signing of PDF documents using a token.
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SSL сертификаты VeriSign GeoTrust Thawte Comodo GlobalSign TrustWave 