Adobe Acrobat Timestamp Servers
What is the Adobe® Acrobat Timestamp Server support?
Here's an example PDF file that you can download to view and verify on your computer with Adobe Reader. (More Samples Here) Summary: The content of this PDF file has been notarized by DigiStamp via an electronic timestamp. This is evidence that this content and your signature existed at a point-in-time. You can view this evidence using Adobe Acrobat on your computer. This file's content cannot be altered without the tampering being detected by the Acrobat Reader software.
Supported Versions: Adobe Acrobat 7 and newer support both digital signatures and trusted timestamping.
Value added: Trusted third-party witness to the contents of the document and when you signed the document. If a digital signature is used, the timestamps adds these protections to the signature (more information is here).
Privacy maintained: Timestamping does not send your document over the internet - only a SHA hash of the signature is sent to DigiStamp to create the timestamp (more information is here).
No additional files needed: The document, digital signature, and trusted timestamp exist together in the single .PDF file.
For further information on the Acrobat products contact Adobe Systems (http://www.Adobe.com).
Users Evaluating our Service with a Test Account: Test account users will need to use certificates and URLs for test accounts.