According to a Scripps Howard news item, it's generally a violation of NFL rules to watch the game on a screen larger than 55".
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In what had to be the worst public-relations move since Custer threatened the Indians, some insensitive lawyers who represent the NFL ended up, as one headline stated, "pulling the plug" on big-screen TV parties for last Sunday's Super Bowl, forcing cancellation of these affairs in churches and homeless shelters across the country. The popular gathering of parishioners and the destitute to eat, pray and root for their favorite team in places outfitted with the newest technology violates the league's copyright restrictions on screens larger than 55 inches, according to the league.