Bitcoin have been copyrighted and have a central control, the only thing people can actually do is like refuse the XT client? really? again I don't know your opinion might be different.
Bitcoin copyrighted, perhaps I am misunderstanding what you are trying to say? The entire source code, and platform is released with an MIT license. As long as you include the same license, everyone is free to copy, modify, distribute, monetize the software underlying Bitcoin, and most of the other cryptos.. Someone could trademark the name Bitcoin still, I think... Will have to check on that..
While a determined group may be able to exercise the ability to control all the nodes, install/implement custom software that doesn't allow inputs from targeted groups, or people. That would inherently alienate the end-users. I would think simply moving to a different altcoin not dominated by a single group would be the solution to that problem.
When the people who are broadcasting bitcoin nodes, block finding/confirming transactions with miner, and crypto trading platforms are jailed, and/or charged for those activities. Then you will know Bitcoin has been assimilated into the current monetary structure controlled by hierarchically established entities. If you have to purchase a license to use send/receive cryptocurrency, ASIC mining hardware, from your state/government then you will know of centralized bitcoin control. Nobody can freeze assets on the blockchain as is, it is imperative that it stays that way. Even if senators, presidents, or other reps cry for control/regulation under ruses such as like money laundering(Physical USD is still the best for this), illegal markets, violation of current monetary laws, and other nefarious reasons to get the masses scared (Problem-Reaction-Solution time right? Pffft...) inherently obliging/supporting to all the proposed new laws around this "speculative commodity"/currency. Look at who is all stuffing those shiny quarters in input slot of the Pseudo-Representative of the state/government proposing the new laws.
Or, such is the case in the USA (most castrated country I think when it comes to monetary policy) watch for them ninja bills that seem to keep finding themselves attached to happier named bills that have no relation, to the primary bill. Attached to pass. If the house, and senate can pass through bills such as the original Patriot Act into law. Anything is possible.