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license are fine with that.
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Question : Can the neighbour be free from blames for the
"mooching"
Technically, yes. The laws here are pretty ambiguous on this
issue. There's no stating of whether it needs to be done on purpose
or accidentally. Either way, to be sure, just turn off your
wireless when you are not using it or change Windows settings. Tell
it not to connect to any other wireless networks except
yours.
In Linux, I don't believe there's such thing called accidental,
because Linux is not automatic for this sort of thing. Maybe I'm
wrong, because I'm using Ubuntu. Those using other distros can
correct me.