Freedom of panorama
A copyright rule in many countries that lets anyone photograph and share images of artworks and buildings permanently installed in public places.
The rule varies sharply by country, which surprises people. Canada's Copyright Act expressly permits reproducing architecture and sculptures or works of artistic craftsmanship that are permanently situated in a public place. The United States' equivalent covers buildings only. A commercial use of a photograph of a copyrighted sculpture can still infringe, even if the sculpture sits in a public park.
For anyone publishing guides, maps, or tourism marketing, the practical takeaway is to know which regime you're in and clear permissions where the law is narrow. For programs, it's a reason to address photography rights in the commissioning contract, so the city can actually promote the work it paid for.