e.Digital Corp owns 5 patents which it refers to as its Flash-R™ Patent Portfolio. The company has made licensing of its patented "MicroOS" flash file system, also called the "Norris Flash File System" or "NFFS," a priority since 1997.

e.Digital was the first company to design and manufacture a dedicated hard drive-based portable media player for the IFE industry and is one of the leading producers of dedicated portable In Flight Entertainment (IFE) to airlines around the world.

Despite the lack of major success within the device market after numerous products and partners over the years, the company claims that its patent holdings relating to flash memory are "fundamental and valuable, particularly in the areas of content file management, optimal flash memory management, and in removable flash applications."

The Company unveiled the first portable recorder with removable flash memory in 1993 and believes its patent portfolio to be essential to many consumer electronics products that utilize flash memory including cell phones, digital cameras, camcorders, PDAs and other popular devices.

US5491774: Handheld record and playback device with flash memory.
US5742737: Method for recording voice messages on flash memory in a hand held recorder.
US5787445: Operating system including improved file management for use in devices utilizing flash memory as main memory.
US5839108: Flash memory file system in a handheld record and playback device.
US5842170: Method for editing in hand held recorder.