Err...no. Stealing signals (or at least trying to) is universal. All teams do it every weekend.
The Dolphins bought game tapes of the Patriots to study Tom Brady’s audibles before a MNF game in December, 2006. Zach Thomas admitted to knowing all Brady’s signals from the tape study. The league ruled that such tape study was okay.
http://usatoday30.usatoday.com/sport...dy-audio_x.htm
"Our guy keeps a pair of binoculars on their signal-callers every game," says Broncos coach Mike Shanahan. "With any luck, we have their defensive signals figured out by halftime. Sometimes, by the end of the first quarter."
http://www.si.com/vault/2002/01/14/3...lent-treatment
Former Eagles Quarterback Ron Jaworski admitted that, when he played, his backup QB would spy on the defense and signal Jaws by dropping red flags to indicate blitzes. He also said that he had no problem with Pats taping the Rams before 2001 Super Bowl.
http://sportsrants.com/nfl/2015/01/3...fl-hypocrites/
And this tweet, from today:
Tom E. Curran retweeted
Frank Schwab @YahooSchwab 2h2 hours ago
What Herm Edwards said on ESPN - teams send pro scouts to watch coaches from press box and figure out signals. "It happens every Sunday."