Jessica Simpson has been legally barred from saying DirecTV's high-definition channels look any better than those on cable.

Now, Time Warner Cable wants to stop Back to the Future actor Christopher Lloyd from claiming the direct-broadcast satellite operator can offer "more HD capacity than cable."

The No. 2 cable company upgraded its legal strategy last week, after a federal judge granted its request for a preliminary injunction blocking DirecTV ads in Time Warner markets that claim the satellite carrier provides superior HD quality. Those included two TV spots, one featuring actress/singer Simpson and another with ex- Star Trek front man William Shatner, with the tagline, "For an HD picture that can't be beat, get DirecTV."

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