In Canada, some photography restrictions are enacted under provincial laws or municipal by-laws. In the case of Québec, generally speaking, commercial, editorial and artistic are the same thing. It doesn't matter if a photo is published in a newspaper or hung in a gallery and it doesn't matter whether or not the photographer uses the image for monetary profit.
It is legal to photograph people who are in a public place without their consent. It is legal to publish their photo without obtaining their consent if the photo covers a newsworthy event. Otherwise,or if the subject was photographed in a private place, the subject's permission is required for any kind of public display.
It is NOT legal to publish (in the media, a gallery display, a personal blog), without consent, the image of a recognizable person who is the main subject of the image unless the image was taken to record a newsworthy event.
Example: You take a photo of a clown who is entertaining children in a public park. The clown is the obvious main subject of the photo but a group of children who are being amused is visible in the photo. You can publish or display (commercially, artistically or editorally) the group photo without the consent of the clown or the children (i. e., their parent). If you crop the photo so that only the clown is recognizable, no consent is required because he was performing publicly and the event is " newsworthy" and he wanted to be seen. Since the children are incidental to the photo, you CANNOT publish (or display in a gallery) without consent, a cropped photo that is essentially a portrait of one or several of them.
A few years ago, the Supreme Court of Canada handed down an important decision in this area. A photographer was taking pictures of a public demonstration. He noticed a young women sitting in a nearby doorway. His portrait of the woman was later published in a magazine. She sued and won because she was not depicted as the main subject of a newsworthy event or even as a recognizable onlooker of that event but as a private individual present in or observable from a public place.
http://canlii.ca/en/ca/scc/doc/1998/1998canlii817/1998canlii817.html
In Québec, there is a right to privacy. The Supreme Court said, "The right to one’s image is an element of the right to privacy under s. 5 of the Quebec Charter of Human Rights and Freedoms. If the purpose of the right to privacy is to protect a sphere of individual autonomy, it must include the ability to control the use made of one’s image. There is an infringement of a person’s right to his or her image and, therefore, fault as soon as the image is published without consent and enables the person to be identified." However, the Court recognized an exception for photographs of "newsworthy events" that covers the principal subjects and the incidental subjects (if the images of the latter are in the context of the newsworthy event.
There are NO exceptions for photos taken of people who are in a private place.