Links:
[1] http://www2.digi-sign.com/product/timestamp/server
[2] http://www2.digi-sign.com/winpop/time-stamp.php
[3] http://www2.digi-sign.com/winpop/annual-license.php
[4] http://www2.digi-sign.com/annual-license
[5] http://www2.digi-sign.com/winpop/support.php
[6] http://www2.digi-sign.com/support/options