Volume 5 ("DAE") of the Forum specifications references a list of root certificates that are required to be supported for the SSL and TLS protocols.
That list can be found in the spreadsheet available here (xls).
The contents of this spreadsheet were developed by the UK Digital TV Group whose contribution is very much appreciated by the Forum.
For an explanation of how the original list was derived by the UK DTG, please see:
Date updated: 30th March 2012 (by the UK DTG CTV Security Group)
Date published: 21st June 2012