DirecTV Group Inc. and TiVo Inc. said Wednesday that they are extending their service agreement for three more years.

TiVo's relationship with DirecTV was set to expire next year as the El Segundo-based company switches to a different digital video recorder device manufactured by News Corp.-controlled NDS Group Plc. The company said last August that it would no longer market TiVo's digital video recorders and would instead use its own system. News Corp. also has a major stake in DirecTV.

As part of the new agreement, existing subscribers to DirecTV's satellite television service will be able to continue to receive TiVo's service via set-top digital video recorders, with Alviso-based TiVo providing ongoing maintenance and support.

DirecTV and TiVo said they will not to assert patent rights against each other. The agreement also extends the advertising relationship between the two companies.

Specific financial terms of the agreement were not disclosed, but the companies said terms are similar to the original 2003 deal.

Shares of DirecTV were up 0.1 percent to $16.52 in late-morning trading on Wednesday.

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