DMCA applies only in the US
The DMCA only applies in the US (and prob ably to people & places where they have jurisdiction). But, many other countries, including my own UK, have similar laws.
What is happening though is that the mighty US of A as the (self appointed) sole arbiter of what is right and wrong and general head bully in the global playground is pressuring other countries to impose the same laws in support of it's big money corporations.
There is however a much better way to kill off things like this stupid AACS stuff. If everyone goes out to their local big-name electrical retailer, looks at a nice HD TV, asks some educated questions, and demands a guarantee* then the manufacturers will turn around and tell the MPAA where to stick their encryption ! Remember, the movie studios NEED the consumer electronics manufacturers, not the other way around !
* Simply ask the retailer for a written guarantee, backed by the manufacturer, that they will upgrade or repair any of their equipment that ceases to function properly due to failures or revocations in the decryption system. Such guarantee to be without time or monetery limit. No guarantee = no sale.
That WILL make the manufacturers sweat if enough people do it. It means that if someone gets the key for a big brand TV, then the manufacturer would have the task and cost of upgrading every TV they ever sold with that key in it. Who is going to accept that sort of business risk ?
Sad thing is, 99+% of the population will never even know that their new kit might stop working by design, and so they will never ask.
The other approach is to go out and buy loads of disks, then return them when they don't play - if it "doesn't work" then under consumer law you are legally entitled to a full refund ! The cost of lassing all these opened disks back to the manufacturers will really p**s off the distribution channel who will then give the perpetrators some grief.
What will the studios do if retailers refuse to stock their films ?
So the biggest line of attack should be to capture and release the keys to as much consumer equipment as possible - leave the studios stuck between the rock and hard place. Do they ignore it, or do they create mayhem by breaking lots of consumer electronics equipment (and of course opening themselves up to a class action lawsuit !).