Disklavier

I live in an apartment building, and there must be a dozen or so wifi
users here.  Most all of us with existing wifi networks, I use the
Apple Airport system, provide them with password protection to
prevent unauthorized use.  When I had my MRK IV up and running I was
disturbed to find my DKV listed among other networks in the building,
AND NO SECURITY PROTECTION.

Is there some way to provide security protection so that others will
not mess with the DKV or attempt to use it for access to my other
computers or to the internet?

Is Yamaha aware of this security flaw?

Steve