# Digital program insertion
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{{Short description|Broadcasting technology to insert contents}}
{{refimprove|date=June 2009}}
'''Digital program insertion''' ('''DPI''') allows [cable headends](/source/Cable_television_headend) and broadcast affiliates to insert locally generated commercials and short programs into remotely distributed regional programs before they are delivered to home viewers.[{{cite magazine |date=August 1, 2008 |author=Yaniv Ben-Shushan |url=http://broadcastengineering.com/infrastructure/seamless-ad-insertion |title=Seamless Ad Insertion |magazine=Broadcast Engineering |url-status=dead |archiveurl=https://web.archive.org/web/20130218230400/http://broadcastengineering.com/infrastructure/seamless-ad-insertion |archivedate=February 18, 2013 }}]
Digital program insertion also refers to a specific technology which allows an [MPEG transport stream](/source/MPEG_transport_stream) to be spliced into a currently flowing MPEG transport stream seamlessly and with little or no artifacts. The controlling signaling used to initiate an MPEG is referred to as an [SCTE-35](/source/SCTE-35) message. The communication API between MPEG splicers and [content delivery](/source/content_delivery) servers or ad insertion servers is referred to as SCTE30 messages.