IBM and the Fox Entertainment Group are working together on a new copy-protection technique that's aimed at keeping local broadcast TV content from being sent over the Net outside its home market. ¶ The technique, which the companies are collectively seeking to patent, is a variation on the "broadcast flag" rules mandated by the Federal Communications Commission and going into effect later this year. ...¶... The IBM-Fox technique will let devices that read or receive TV content use the digital broadcasts to identify themselves as part of a home broadcast market. They will then refuse to hand TV content off to devices from other local markets, using that measure as a way to keep content in its authorized area, the companies said. ... Link: CNET news.com.