Hook Limit Confusion?

[Giuga10]

I was thinking about the maximum of 4 hooks limit and had some questions.

I'm planning on buying a 4 wire Alabama Rig, and I was thinking of trying some plastics along with spinners on it, however would I have to change all of the spinner hooks to singles instead of trebles, now here is where my confusion began, many crankbaits have two trebles on them which would mean there are 6 hooks on them, 2 more than the limit but they are still legally used all the time, are there certain exceptions?

Can anyone clear up the confusion, is a treble hook considered one hook?

Thanks for any help.