[1] By virtue of the fact that the Digi-CAST3™ Team will help you select the correct Time Stamping [2] Policy and TimStamping Authority Practice Statements so that they comply with this standard, this means that the subsequent use of the Digi-CA™ [3] in accordance with these document means that it is compliant with this standard.
Links:
[1] https://www.digi-sign.com/downloads/download.php?id=digi-ca-pdf
[2] http://www2.digi-sign.com/digi-ca/time+stamp
[3] http://www2.digi-sign.com/digi-ca