The DVD Copy Control Association (DVD-CCA) is an organisation primarily responsible for the copyright protection of DVDs. The content scrambling system (CSS) was devised for this purpose to make piracy difficult. The association is also responsible for the much criticised regional playback control[?] (RPC), the region encoding scheme which gives movie studios geographic control over DVD release dates to maximise their investments and also help thwart piracy.
... now in a form in which we can conveniently complete the square[?]. To "complete the square" is to add a constant (i.e., in this case, a quantity that does not depend on x) ...