In 2006, bandwidth was a massive bottleneck. The number 500 typically specified either a target video bitrate of 500 kbps (kilobits per second) or an optimized file size targeting roughly 500 Megabytes to fit comfortably on early flash drives or standard CD-Rs (which maxed out at 700MB).
A vintage release from the Soft On Demand "OPEN" series. This particular entry dates back to May 2006 and features [Insert Performer Name if known]. This is a standard-definition archival copy of the original 604th entry in the series. Notes: