Katty - Angels In The World Ssk-001.mp4 25 ((link))

The filename's construction—Artist - Title (Production Code) FileType Metadata—is a common format used in peer-to-peer file-sharing networks and online forums. It was very likely created by a fan or a collector to organize and share content. "SSK-001" would, in this hypothesis, function as a production code for a specific scene or project that was not widely commercially released.