[n. proj-ekt, -ikt; v. pruh-jekt]
Mohole, Project, program proposed in 1957 to drill a hole down to the boundary between the crust and the mantle, known as the Mohorovičić discontinuity at about 4 to 43 mi (7 to 70 km) below the earth's surface. Initiated by the American Miscellaneous Society, a loose organization of scientists, the main purposes of the project were to determine the nature of this boundary and to attempt to fill gaps in the geologic record from samples of the rocks encountered. The technology of such a project, however, was beyond the state of drilling technology at that time. Groups such as the National Science Foundation and the National Academy of Science eventually backed phase 1, in which five holes were drilled off the coast of Mexico, the most successful entering 601 ft (183 m) into the ocean floor under 2.2 mi (3.5 km) of water. The project was abandoned by 1966, as funding to support the ever-increasing costs of the project failed to gain congressional approval. Nevertheless, ship positioning and design, along with deepwater drilling technology developed for Project Mohole, were employed in the Deep Sea Drilling Project and future drilling projects.
This article is about the free and open-source software media project. See helix (disambiguation) for other meanings.

Helix is a project to produce software that can play audio and video media in various formats, aid in producing such media, and serve them over a network. It is intended as a largely free and open source digital media framework that runs on numerous operating systems and processors (including mobile phones) and was started by RealNetworks which has contributed much of the code.

Helix DNA Client is the multi-platform multi-format media playback engine. Helix Player is a media player that runs on Linux, Solaris, Symbian and FreeBSD and is built on top of Helix DNA Client. Helix Producer is an application that can aid in the production of media files, and Helix DNA Server can stream media files over a network.


The code is released in binary and source code form under various licenses, notably the proprietary RealNetworks Community Source License and the free and open source software RealNetworks Public Source License. Additionally, the Helix DNA Client and the Helix Player are licensed under the popular GNU General Public License (GPL) free and open source license.

Use of the RDT, the default proprietary Real data transport, and of the RealVideo and RealAudio codecs requires binary components distributed under the Helix DNA Technology Binary Research Use License.

Helix DNA Client

Helix DNA Client powers many digital media applications, including RealPlayer for Windows, Mac OS and Linux (since version 10), RealPlayer Mobile, and Helix Player. It is used on Nokia, Motorola, Samsung and Sony Ericsson mobile phones. According to, 125 million mobile phones with the Helix client have been shipped since 2006. It is also being used in embedded devices like the Internet Tablet OS from Nokia, which is found on the Nokia 770, N800 and N810 Internet Tablets. Cingular Video is also based on the framework. Other projects that use the Helix framework include RealNetwork's Rhapsody online music service, the Banshee and Amarok music players, and MediaReady 4000.

Another project that is taking advantage of the Helix DNA Client is the One Laptop Per Child project. A group of developers from the Open Source Lab are currently working on a media player API for the project, and will continue on using other Helix technologies to create applications for content creation and content collaboration.

Helix DNA client contains support for the following media formats:

Helix DNA Server

The Helix DNA Server, first released on 22 January, 2003, supports streaming RealVideo, RealAudio or MP3 to any device or application that supports the [] or RTSP streaming protocols.

See also


External links

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