Retric's other comments explain why this is legally and factually accurate based on the current state of US and UK copyright law. Basically, a "derivative" wor

Retric's other comments explain why this is legally and factually accurate based on the current state of US and UK copyright law. Basically, a "derivative" work product that is mechanically (i.e., algorithmically) created from another copyrighted work is infringing because there is no creativity in the second work and the torrent hash's sole use is distributive. The selection of algorithms or parameters generally is not sufficient "creativity" (but can be, in very limited circumstances). Ergo, a torrent is an infringing derivative work. A summary requires some creative thought, specifically, what plot elements to discuss and which to leave out, how to state the plot, etc. The summary generally also has a non-distributive use in its own right. Consequently, a summary is also a derivative work but is not infringing.