This sort of thing makes it hard for me to take any of the article seriously. The author doesn't seem to know the first thing about either video formats or the authorial role of editing. Things are cut on particular frames for a reason. Also, editors don't deal in milliseconds, they deal in frames. Sound editors work in frames and samples, and while I have no objection to steganography-type adjustments to the final output, the idea of monkeying around with the content of the film, even on the margins, for tracking purposes tells me that the writer shouldn't be allowed anywhere near a post-production facility, for the same reason that most programmers don't want an art director telling them how totheir code would look prettier in a fancy font and in a more earth-toned color scheme.

Honestly, I think HBO is quite well aware of this srot fo thing already, and the 4 episodes were leaked to hook people on the rest of the series. There's already a lot of digital distribution technology involving rock-solid encryption, single-use keys, check ins and outs, and so on. Tweaking things like the length of the end credits (or rather the black frames at the end) are potentially viable but also trivially obvious to any editor. But monkeying with the program material is strictly out of bounds.