The FBI is asking for help in identifying a child predator.
Authorities said a video of the man engaging in sexually explicit activities with a young boy was discovered online in November 2012 by the National Center for Missing and Exploited Children.
The video contains no clues linking the man to any particular state or region of the United States, but it does have a brief image of him, and investigators hope someone will recognize him and come forward.
The man known to investigators as John Doe 28 is wearing wire-framed glasses and a burgundy T-shirt with a fish logo.
The video shows him and the victim inside a residence with what appears to be a blue chair and a picture hanging on a wall in the background. Authorities said someone familiar with the house might easily recognize the chair.
Anyone with information is asked to call the FBI's toll-free tip line at 1-800-CALL-FBI.