A system and method for automatically protecting private video content using embedded cryptographic security is disclosed. The method of feeding said animal feed reduces ammonia emissions from manure produced by animals fed the animal feed compared to the emissions obtained from manure when an acidogenic substance is fed alone and compared to the emissions obtained from manure when a cation exchange capacity material is fed alone. The piston includes a piston cylinder having a head plate. Third groups to which these second data is opened are determined based on first groups of the first data set to be opened and second groups to which a user setting the association belongs.