Abstract: A digital differential steganographic system and method includes a master key that is generated from an unmarked media, a mark-point reservoir created from the unmarked media and containing a set of viable candidate mark points for the unmarked media, and a mark-point applicator to insert data into the unmarked media at selected mark-points chosen from the mark-point reservoir creating a digital watermark. The method includes using an original unmarked media, shaping and testing marks in the original media for predictable distortion, verifying embedded marks at point of insertion in the original media, minimizing mark energy and duration for least-perceptible change, and using non-distributed, unmarked media of the original media as a master key.

Abstract: An oilfield equipment identifying apparatus for use with a drilling rig. The drilling rig preferably has a rig floor, a drilling device, and an equipment path through at least one of the rig floor and the drilling device. The identifying apparatus comprises a computer and a reader assembly. The computer is loaded with an oilfield equipment database. The reader assembly is in communication with the computer, and comprises at least one surface acoustic wave RFID tag reader adjacent to at least a portion of the equipment path of a drilling rig. The reader remotely reads at least one unique identification code from a surface acoustic wave RFID tag associated with a piece of oilfield equipment and transmits the unique identification code to the computer.

Abstract: A digital differential steganographic system and method includes a master key that is generated from an unmarked media, a mark-point reservoir created from the unmarked media and containing a set of viable candidate mark points for the unmarked media, and a mark-point applicator to insert data into the unmarked media at selected mark-points chosen from the mark-point reservoir creating a digital watermark. The method includes using an original unmarked media, shaping and testing marks in the original media for predictable distortion, verifying embedded marks at point of insertion in the original media, minimizing mark energy and duration for least-perceptible change, and using non-distributed, unmarked media of the original media as a master key.

Abstract: A system for testing a display device is disclosed. A base has a surface with at least four holes in it. The display device has two layers and a surface. The first layer is a semiconductor substrate. The second layer is a transparent material. The surface of the display device is coupled to the surface of the base at each of the at least four apertures. The holes are positioned relative to the display device such that gravitational forces on the display device are optimally counterbalanced.