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Bter.com is a exchange platform which supports , BTC, litecoin, LTC, FTC, feathercoin namecoin, ppcoin, terracoin, freicoin, NMC, TRC, FRC, PPC trading.
The legality on and other depends on where you are and what you wish to do with it.
https://en.wikipedia.org/wiki/Bitcoin
https://en.wikipedia.org/wiki/Bitcoin_network
Bitcoin – Wikipedia