The only database ID I am aware of that McAfee uses is for the legacy version of Endpoint Encryption(the non ePO integrated version), you send them a DB ID and they then send back a license based on this key.
Maybe your purchased something like total protection for data ?
All you should need for DLP is the license key that is included in the software you downloaded.
to get the EEPC EEM database id, just open the licence information screen (from the file menu if I remember correctly).
It's nothing to do with DLP though.