Links:
[1] https://wwwtest.digi-sign.com/product/digi-seal/server
[2] https://wwwtest.digi-sign.com/winpop/digi-seal.php
[3] https://wwwtest.digi-sign.com/winpop/annual-license.php
[4] https://wwwtest.digi-sign.com/annual-license
[5] https://wwwtest.digi-sign.com/winpop/software-validity.php
[6] https://wwwtest.digi-sign.com/validity+period