No, I can do anything what is not forbidden. ... this is how new inventions works
That's what mtgox thought too btw, see where it got them.
It is forbidden and I already told you why.
You're obviously clueless. MtGox accounts in US were frozen because they were operating without a money transmitter license not because they were trading, facilitating the sale of bitcoin.
Bitcoins are illegal because they're not legal tender
In March 2013, the U.S. Financial Crimes Enforcement Network issues a new set of guidelines on "de-centralized virtual currency", clearly targeting Bitcoin. Under the new guidelines, "a user of virtual currency is not a Money Services Businesses (MSB) under FinCEN's regulations and therefore is not subject to MSB registration, reporting, and record keeping regulations." Miners on the other hand, might need to register, if they sell bitcoins for "real currency or its equivalent".[1]
In general, there are a number of currencies in existence that are not official government-backed currencies. A currency is, after all, nothing more than a convenient unit of account. While national laws may vary from country to country, and you should certainly check the laws of your jurisdiction, in general trading in any commodity, including digital currency like Bitcoin, BerkShares, game currencies like WoW gold, or Linden dollars, is not illegal.
https://en.bitcoin.it/wiki/Myths#Bitcoins_are_illegal_because_they.27re_not_legal_tender
