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RealNetworks

(RNWK)

, which produces software for receiving audio and video over the Internet, said

Sony

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will include both RealPlayer and RealJukebox with its portable music devices and Vaio PCs, beginning in 2001.

RealNetworks will use Sony's latest high quality audio compression technology in its updated RealSystem 8, which the company unveiled today.

Shares of RealNetworks were recently up $1.31, or 6%, to $23.31 in

Nasdaq

trading, while shares of Sony fell $1.94, or 2%, to $95.06 on the

New York Stock Exchange

.