Patent ID: 6985588

Claim:
A system for controlling access to digital information, comprising: a first information processing device adapted to process digital information for access only at a specific geographic location, the first information processing device including a processor having suitable memory adapted to store software instructions operable to cause said processor to perform the functions of: retrieving a location value that identifies a specific geographic location at which access to digital information is authorized; generating an area parameter defining a shape of the specific geographic location without identifying the specific geographic location; combining the location value and the area parameter to provide a first location identity key; encrypting the digital information using the first location identity key; sending the area parameter and the encrypted digital information; and a second information processing device adapted to access the encrypted digital information, the second information processing device including a processor having suitable memory adapted to store software instructions operable to cause said processor to perform the functions of: receiving the area parameter and the encrypted digital information; determining a current location of the second information processing device; combining the current location and the area parameter to generate a second location identity key; and decrypting the digital information using the second location identity key.