One aspect, perhaps worthy of some scrutiny, is how the database of hashes is produced. One presumes there's an assortment of cable boxes and/or satellite dishes feeding hundreds of channels into an ingestion mechanism that stores the fingerprints into a database. There are a lot of edge cases that are technically challenging, especially when considering the 210 or so local markets in the US. It'd be interesting to learn how that is done and whether any digital locks are circumvented in the process.