[jonatanheyman]

Ah, I didn't know that, thanks. In those cases you're probably correct that it's illegal to put up such camera without obtaining a permission. Though I don't think it's the law about "Kränkande Fotografering" (roughly translates to "Offensive Photography") - which is the law that makes it illegal to put up secret cameras in a home - that you'd be violating, but rather some other law that regulates surveillance cameras.