ALEXANDRIA, Va., July 21 -- United States Patent no. 12,689,530, issued on July 21, was assigned to Dell Products LP (Round Rock, Texas).

"Content with ultrasonic signature for verification of authorship" was invented by Charles D. Robison (Burford, Ga.), Michael S. Gatson (Austin, Texas) and Karun P. Reddy (Austin, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method may include during playback of content, periodically capturing an audio overlay of an audio track of the content, wherein the audio overlay includes an encrypted timestamp associated with a time of creation of the content. The method may also include, during playback of the content: periodically extracting the encrypted timestamp from ...