Zattoo is a proprietary peer-to-peer Internet Protocol Television system ("P2PTV") with current focus on European channels, licensed content, and DRM. It is developed by researchers and programmers based out of Ann Arbor, with corporate offices in San Franciso and Zurich. As of August 2006, the product is in beta testing and use is by invitation only. The player is based on H.264 (QuickTime and ffmpeg), and is MacOSX and WinXP compatible. It needs a minimum downstream bandwidth of 400kbps on the client side.

Zattoo was first tried out with Swiss free-to-air channels coinciding with the 2006 FIFA World Cup. Starting from 4 swiss TV channels (SF 1, SF 2, TSR 1 and TSI 1), it now offers 21 free-to-air or free-to-view TV channels in Switzerland. According to the website, other channels are being added in the future

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