Sorry. I didn’t see any tag.
Not your fault.
With normal viewing, unless there's a printed cation saying it's Copyrighted, it's impossible to know.
The one 'bad thing' about Digital Photography is the way it buries important data in the image file and 'Photo novices' don't know about it or how to find it. Most times it's the cool stuff that shows (for Photo Buffs anyway) like Camera Make and model, Lens used, if the Flash fired, and all the exposure data.
{then we'll run to the Photo Store (or website) and say, 'I WANT "THAT"' ;-)]