RealNetworks ( ) is a provider of Internet media delivery software and services based in Seattle, United States. The company is best known for the creation of RealAudio, a compressed audio format, RealVideo, a compressed video format and RealPlayer, a media player. The company is also known for its subscription-based online entertainment services like Rhapsody, SuperPass, and RealArcade, and for its media properties like Film.com and RollingStone.com (which it operates in partnership with Rolling Stone owners Wenner Media).
RealMedia streaming files can contain RealAudio and RealVideo streams, and several other formats like SMIL. Helix is their free software / open source media framework. The code is released under various licenses, like the RealNetworks Public Source License starting in 2003 and the GPL in 2004. Not all of the source code is licensed under one of the free software licences, for example the codecs.
