Sorry about that. It should have been CDDB. I posted that a 4 in the morning and my brain was slightly disjointed.
CDDB (which stands for Compact Disc Database) is a database for software applications to look up CD (compact disc) information over the Internet. This is performed by a client which calculates a (nearly) unique disc ID and then queries the database. As a result, the client is able to display the artist name, CD title, track list and some additional information.
The database is used primarily by media player and CD ripper software.
Try to disable the CDDB lookup. If it can't be disabled, you will just have to continue blocking access.