To use time-stamps you must subscribe to at least one Trusted Third Party server. You will have a User name and Password for each TTP. EEcerts can provide an extra layer of security by including these in its time-stamp set-up. This authentication data is then locked away by Windows.
When you configure a signed document for time-stamping, the TTL sends its digest to a Time Stamping Authority. The TSA time-stamps the digest then signs it, using its own private key. This new digest is passed, with the time-stamp, to you via the TTP. You should store the digest and time-stamp with the document. Neither the TTP nor the TSA have any access to the original data in the document at any time.