[1] This standard has been formed to define smart card standards [2] for key & certificate storage and Digi-CA™ [3] complies with this standard, as the Digi-Card™ smart cards provided for use with the Digi-CA™ are compliant with this standard because they have been designed by the vendors in accordance with the PKCS#15 standard.
Links:
[1] https://www.digi-sign.com/downloads/download.php?id=digi-ca-pdf
[2] https://www.digi-sign.com/compliance/introduction
[3] https://www.digi-sign.com/digi-ca