Is the Shah's Rule a Diktatorship?

The Shah's rule was obviously a dictatorship, but I imagine that he didn't advertise it as such. What sort of nominal democratic rights and powers remained under the Shah? How did the state in government actually function? And what were people's supposed and then actual rights vis-a-vis that state? Yeah, that's a terrific question. It's important to note here that the Shah's approach and even his rhetoric shifts from the post-Koo period through the 50s, 60s, and up to the sort of lead up to the revolution.