A system and method for identifying the player that leaked content encryption keys by loading a set of player keys into individual content players and determining the number of encryptions and the number of encryption keys to use in multiple encrypting critical content. The opening element has an outer thread and is arranged inside the base. A plurality of 3-to-2 compressors each in respect of remaining bits of the operands receive a respective bit of the operands or its complement, and a 2-input adder coupled to the 3-to-2 compressors receive respective carry and save outputs thereof and computing respective bits of the sum apart from the least significant bit. A shadowbar may be used to indicate areas of overlap among users with a shading and coloring indicative of a degree of overlap. To form an implant near the surface of a substrate, a photoresist pattern with openings over the desired implant area may be used. 002 to 20% by weight of graphite particles.