A 'key' attached to the cap of a PET bottle so that it cannot be drunk by others

This is good ... Even if my younger brother at my parents' house says 'Don't drink', I drink more and more, so I'd like to add this and limit it.

Japan.internet.com Web Business-Where you have the key, where you don't
http://japan.internet.com/busnews/20050720/7.html

This site sells 'keys' that can be attached to PET bottle caps. The key is a dial type and can be unlocked by combining three numbers.

It also has a feature that allows you to put a photo at the top for those who don't know which one they are.

With it, no one will accidentally borrow your drink, even if it's not malicious.

Click here for selling sites
http://www.kwiktop.com/

There seems to be one for glass bottles ...
http://www.kwiktop.com/kwiktop_products.htm

It seems to be used like this
http://www.kwiktop.com/how_it_works.htm

I wonder if you can sign an agency contract somewhere in Japan and sell it ...