Street Photography and the Law

Might anybody be able to give me Chapter and Verse on the law in relation to Street Photography in Buenos Aires? Military installations notwithstanding, I think I need permission to take photographs on or from somebody else's property but what I can see from the street I can shoot from the street - subject to common decency and behaviour of course, whether or not it is the law.

Is there anything that I have missed out or just got plain wrong?

I've filed this under Travellers Stories because, depending on the answers I receive, I may have a story to tell you. But if it turns out that I am in the wrong I shall deny everything.

I think we used to have journalists and photographers who worked in BsAs who contributed to this forum. They would have had more than a passing knowledge of the relevant law, I'm sure.