if you are living in such a country where bitcoin is banned. then if you are holding or selling your bitcoin then it is illegal. but if your country has yet not given any statement about bitcoin then it is legal. and you can use or can sell it very easily. without any restriction.
But please, make sure to pay your taxes (if your country requires it, most do). It seems like the taxation is the vector a government is most likely to harass a bitcoin user with, along with regulation (you don't have a license).