Graphene is published under the MIT license. Use it as you see fit. https://github.com/cryptonomex/graphene

Thank you! That is only to have fun, actually. So bugs are no problem.

By the way, is there a way to clone the Graphene version that easily? Creating a private testnet counts? In that case, can I distribute my wallet to a few friends to enjoy our own Bitshares?

https://github.com/bitshares/bitshares-0.x

But you really shouldn't do that. It's buggy, and not exactly readable. There's a reason why Graphene was developed.

Anyone to help me play with my own Bitshares 1.x copy? Where to find it, how to do it, any instruction welcome.