More than anything else the thing that pisses me off about Spygate is how it wasn't even about stealing signals, it was about where our cameraman was. It took me years to learn that because the sports media is so corrupt and Pats-hating. And non-Patriots fans? Forget about it, they have no clue.
It was really about too much winning. When the Jets cameraman did the same thing to the Patriots, the league response was, "Who cares?"
In have absolutely NO information on this and it's all conjecture BUT I believe this is how it went:
1. 2006: league sends out badly worded memo.
2. 2006: Belichick decides the team will stop doing it because it's time consuming and is simply meant to force teams to change signals against them. Kind of a useless PITA practice.
3. 2006 season: Jets film Patriots from the sideline.
4. 2006: Patriots report the Jets to the NFL for a practice they believed was illegal.
5. 2006: NFL says what the Jets did was fine.
6. 2006 or 2007: Patriots read the memo and reinterpret it given the NFL is indifferent to filming from the sideline. They think the memo must mean you can't use the info during the game you film it, which is why the Jets got away with it.
7. 2007 opening game: Mangini remembers that Belichick was a twerp for ratting him out to the NFL so the Jets are prepared to return the favor if they see someone filming (Can't really blame Mangini for this).
8. 2007: When the league realizes it's the 3x SB champs doing it and not the Jete, other owners realize this is the opportunity to pounce and kill Darth Belichick and perhaps throw him out of football.
9. 2007: Goodell is simply the mouthpiece; when Bob Costas challenges him and says, "You can film the sideline from practially anywhere even the stands. Is this just a technicality?" Goodell responds that he doesn't believe Belichick, he calls him a liar, and that's why he's being punished.
I have no proof that #2 and #6 happen, all the other stuff did happen, but #2 and #6 are my conjecture.