Israeli technology firm Emblaze has notified Microsoft and Apple that each has infringed its streaming media patent.
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Emblaze's Live Streaming technology allows users to send live or pre-recorded audio and video to other devices.
Emblaze chairman Naftali Shani said: "Emblaze has made substantial investment into research and development to build a rich portfolio of intellectual property over many years. While we are happy to license our technology to third parties, we will vigorously defend our rights and our competitive position."