Q: how to remove itunes match from stolen apple tv

I´ve come to realize that if someone steals my apple tv, they would be able to access my music through itunes match, they will be able to listen to itunes radio also.

I recently took my apple tv to my parents house, and to my surprise the only thing it needs to work is connect it to the local wifi network, no apple id password require nor anything else.

And just like that anybody can get into my music in itunes match, not to mention netflix suscription and probably my movie purchases too.

Dos anybody know how to wipe my account remotely from the apple tv, and any other device for that matter..

thanks a lot