Nope, ignorance of the law is a pretty ancient maxim.
You are deemed to know the law therefore you can't use ignorance of a law as a defence.
Unless a law is secret.
And if it's secret then you shouldn't know about it.
So if you obey it then the authorities can only conclude that you
know about the law.
But it's a
secret law, therefore you know a secret and that means you're in biiiiiiig trouble!