From The Free On-line Dictionary of Computing (19 January 2023):
Real Time Streaming Protocol
RTSP
<multimedia, networking, protocol> (RTSP) An application
layer protocol for controlling delivery of a stream of
real-time multimedia content. RTSP allows users to start
playing from a certain position. It does not actually deliver
the data, but works alongside existing delivery channels such
as UDP, TCP, or IP multicast.
RTSP was developed by RealNetworks, Netscape
Communications, and Columbia University, and is described
in RFC 2326, April 1998. RTSP is an IETF proposed
standard.
FAQ
(http://real.com/devzone/library/fireprot/rtsp/faq.html).
(1999-08-26)