We're currently receiving emails with the same two questions about ANET, a plugin offering multiplayer commands for the lite-C and Extra Edition. Thus, here the official answers:

- Am I allowed to send them my user name displayed in SED Help/About? Yes, you are, but only you user _name_ (which normally is your real name), _not_ your user ID (beginning with "client...") and not your password.

- Is ANET legal as it unlocks a feature that is normally restricted in the lower editions? Yes, this is legal because ANET uses its own functions.

Thanks for clearing that up, officially!
I also received a lot of those mails.