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Privacy concerns
It is possible when providing DVR service to gather real time data on user's
viewing habits.
Patent litigation
On July 14, 2005, Forgent Networks filed suit against various companies alleging
infringement on U.S. Patent 6,285,746 , entitled "Computer controlled video
system allowing playback during recording". The listed companies include
EchoStar, Directv, Charter Communications, Cox Communications, Comcast, Time
Warner, and Cable One.
Scientific-Atlanta and Motorola, the manufacturers of the equipment sold by the
above mentioned companies, have filed a counter-suit against Forgent Networks
claiming that their products do not violate the patent, and that the patent is
invalid. The two cases have been combined into case 6:06-cv-208, filed in the
United States District Court for the Eastern District of Texas, Tyler Division.
According to court documents, on June 20, 2006, Motorola requested that the
United States Patent and Trademarks Office reexamine the patent, which was first
filed in 1991, but has been amended several times.
On March 23,2007 Cablevision Systems Corp lost a legal battle against several
Hollywood studios and television networks to introduce a network-based digital
video recorder service to its subscribers.
The saga continues: http://www.pvrwire.com/2006/04/06/tivo-vs-echostar-lawsuit-update
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