Conlang using hanzi... legal?

Hi. I'm new to the list. I just wanted a little info ^_^
You see, me and a friend of mine are creating a conlang, and the idea of
using the Chinese Hanzi as a writing system seems cool to the both of us.
However, we would like to know this: it's legal if we implement the use of
hanzis into our conlang? I think so, but just to be sure...
Thanks in advance for the attention.

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