Digital Technology Licensing LLC (DTL) is an IP-holding company that owns and licenses U.S. Patent No. 5,051,799 ('799). 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 standard 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.

DTL is a portfolio company of IP Holdings LLC, an IP-centric idea incubator. DTL is managed by General Patent Corporation International.