It is generally a smart idea to get consent first, especially if the imagery is intended for monetized use, such as ads and posters, especially since such use c

It is generally a smart idea to get consent first, especially if the imagery is intended for monetized use, such as ads and posters, especially since such use can result in law suits if done without consent. The one thing that might outweigh this general rule, is if something newsworthy happens, or something that would be deemed important for the public to see, such as a crime. Where I'm from (Norway) the general rule is that a person cannot take up the focus or majority of an image without prior consent. This makes it possible to video or take pictures of public events without needing to ask everyone on the stadium, for instance.