Bitcoin has not been made illegal by law in most territories. However, some territories (such as Argentina or Russia) restrict or prohibit foreign currencies in a severe manner. Other territories (such as Thailand) may limit the granting of licenses to certain entities such as the Bitcoins exchange houses.
Regulators from various territories are taking steps to provide individuals and businesses with rules about how to integrate this new technology into the regulated and conventional financial system. For example, the Financial Crimes Protection Network (FinCEN), an office of the United States Department of the Treasury, issued a guide on how they characterize certain activities involving virtual currencies.