1. A method for controlling access to a secured file that is classified to a classification level, comprising: determining if an attempt to access the secured file conforms to access rules embedded in the secured file; reading the classification level from a header of the secured file; and using, in a computing machine, a clearance key and a second key to decrypt a first key encrypted in a portion of the secured file in response to determining that the attempt to access the secured file conforms to the access rules, wherein two or more user identifiers are assigned to a security clearance level of the clearance key and are thereby granted access to use the clearance key, wherein the clearance key is used to decrypt the first key based on a determination that the security clearance level of the clearance key allows access to the secured file, based on the classification level of the secured file being equivalent to or less than the security clearance level.