I don't even know where to begin ... the article pretty much does all the 'comparing and contrasting' already:
... Knowing that increasingly people will have many networked devices from which they want to access "their" content, CPCM creates an Authorized Domain – loosely, a household – that recognizes these restrictions and within which the content is allowed to flow freely. So what about those 30 monks? Are they a household for the purpose of watching last week's Desperate Housewives?
The effort to create CPCM goes into such scenarios. There are, in the draft, according to Mark Jeffrey from Microsoft, provisions for merging domains (marriage), splitting domains (divorce), frequent arrivals and departures (business travelers or kids of divorced parents), and many others. Simply, whenever you turn on a CPCM-compliant device, it looks around for a domain. If none exists, it creates one with a unique ID number; if it finds one, it joins after negotiating a series of tests that are meant to be "transparent" to the user. These devices are all peers, so that if the first one is not present the domain continues to operate just the same. The system is intended to cover only commercial content from trusted sources; personally generated content remains outside it.
:-o
