The string is a specific release identifier used in the warez and file-sharing scene , specifically for Japanese Adult Video (JAV) .
Indicates the media type is a DVD (as opposed to CD, Blu-ray, etc.). -DVD- CPSKY 055 Vol
"I've locked the override codes in Vol 056," the voice said, urgent and strained. "But they’re coming for the signal. Don't go to the office. Go to the old lighthouse." The string is a specific release identifier used