Frequently Asked Question:

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I digitally sign a pdf document with SignFile function. In Adobe Reader, on Summary page in Signature properties there is Validity summary group. It says: Signature date/time are from the clock on the signer's computer.

Is it possible to add time from some timestamp server to signature?

It's not currently possible to use a time-stamp server when adding digital signatures with Quick PDF Library, instead as you have found, the clock on the signer's computer is used.

Using a time-stamping server is something that we will consider for a future release of the SDK.