> For that matter, there are cool things you can do with cryptography and 
> math that let you have similar relationships with passwords. Stuff like 
> "this file can be decrypted by any three of the seven officers of the 
> company, or by unanimous application of the keys of the department heads 
> of the company. Oh, and we can invalidate any key without invalidating 
> the others."

Sounds like BluRay encryption to me :-)

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