Digital Technology Licensing LLC (DTL) owns and licenses U.S. Patent No. 5,051,799 ('799), a key patent to cellular telephone technology. The '799 patent is essential to using Adaptive Multi-Rate (AMR) codec, an audio data compression algorithm used for speech coding that is widely employed in GSM and UMTS standards for cell phone communications.

The patented technology also provides backward compatibility, which allows cell phones to effectively communicate with older technology in existing cellular towers. Other applications of this patented technology include Bluetooth headsets and digital studio microphones.

DTL is a portfolio company of IP Holdings LLC, an IP-centric idea incubator.

General Patent Corporation (GPC) is the managing member and the exclusive licensing agent for DTL.