When you read through everything in Australia, US, England, and Canada, there are more similarities than there are differences and there are some grey areas.

Bottom line is that photographers are free to take photos of almost anything that is not top secret. You cannot violate a copyright or trademark simply by having it in your photo.
Photos of adults and children in a public place can be taken and used for almost any normal purpose with the possible exception of advertising but that is only if the person is readily identifiable, is a major part of the photo, and there is an implication that the person uses or promotes a certain product.

Owners of private property can institute their own rules, but their only legal method of enforcement is to ask you to exit the property. If security guards for example touch you then they are guilty of assault. No one can seize your camera or your flash card or any other photographic equipment without a court order and that includes the police. You retain any photos taken and can use them in any way you wish. Signs and contracts that imply that by buying a ticket or entering that you are agreeing to not take photos or giving up your rights to your photos to the property owner etc. have no relevance or meaning in law in Canada and probably most other countries as well.

As to privacy, it is generally legal to take a photo of anyone in a public place which is defined in the US as "a location to which the general public has access to." (That is the American legal definition.) Common sense however prevails in that totally inappropriate photos which might constitute pornography or otherwise violate a general consensus of good taste would probably be questionable. Candid photography is still a right of the photographer.

In the US, according to the most recent issue of Popular Photography, photographers are being illegally harassed and intimidated by security guards and the police for taking photos of bridges, transportation and public buildings. One photographer is sueing the police and is likely to win over their heavy handed and illegal actions toward him when he was legally taking photos in a public place.