The company which holds the television rights to the Star Trek franchise could have a “for sale” shingle on it by 2009. Sumner Redstone, the controlling partner of both Viacom and CBS, already is looking to sell a 1,500-screen theater chain he owns, and may need to satisfy investors by possibly unloading either Viacom, the parent company of Paramount Pictures, or CBS. And Redstone has made it clear, he’s not interested in selling Viacom, according to The New York Times. If he were to sell CBS, it wouldn’t be something he’d do lightly, sources told the newspaper. Those involved with the theater sale cannot agree on how much the chain is actually worth, and if Redstone can’t reduce some of the $1.6 billion in bank debt he’s accumulated over the years, he may need to unload CBS after already …