ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,470,380, issued on Nov. 11, was assigned to Dropbox Inc. (San Francisco).

"Tertiary-level encryption key scheme" was invented by Jonathan Lee (Seattle), Rajat Goel (San Jose, Calif.), Stas Ilinskiy (Seattle), Wesley Rodriguez (San Francisco), April King (Saint Paul, Minn.) and Joseph Eichenhofer (San Francisco).

According to the abstract* released by the U.S. Patent & Trademark Office: "A system, method, and computer readable medium is disclosed for accessing an object that is encrypted within at least a tertiary-level encryption key scheme. This includes receiving a request to access blocks making up an object by content management system and using a top-level encryption key from a ...