In the shadowy corners of the internet, strings of text like Fall.S01.720p.WEB-DL.AAC.5.1.ESub.x264-HDHub4u are a form of shorthand. To the uninitiated, it looks like keyboard spam. To millions of cord-cutters and pirates, it is a precise recipe for a video file.

This string refers to the first season of the gripping British crime drama starring Gillian Anderson and Jamie Dornan. However, the filename tells us far more about the technical source of the file than the plot of the show.