More and more I keep hearing about situations where photographers are prohibited from making images. In some cases the rules are not followed and the photographers are putting themselves out there for trouble, but in reality there are many laws on the books and people trying to stop you from taking a picture are making up their own rules which makes their actions illegal.
Street Photography and the Law: 7 things you need to know.
https://en.wikipedia.org/wiki/Photography_and_the_law
