As per Wikipedia Articles Why bitcoin is not supported in some countries.
The legal status of bitcoin varies substantially from country to country and is still undefined or changing in many of them. While some countries have explicitly allowed its use and trade, others have banned or restricted it. Likewise, various government agencies, departments, and courts have classified bitcoins differently. While this article provides the legal status of bitcoin, regulations and bans that apply to this cryptocurrency likely extend to similar systems as well.
Read here Whole articlehttps://en.wikipedia.org/wiki/Legality_of_bitcoin_by_country