I have noticed when I upload photos to print at Costco, the website says,
“Photographic and digital images are subject to copyright law. In compliance with federal copyright law, Costco will not reproduce a copyrighted photograph taken by a professional photographer without a signed release from that photographer or studio. The release must be signed by both you and the professional or studio who shot the photograph…..”
In addition,
how common is it for photographers to give the photos to their clients with their logo on the corner?
I can’t answer this for sure, but I know for myself, I don’t watermark photos for print. People probably don’t want my name on their family photo hanging on the wall, and I really don’t feel the need to protect myself or advertise that badly. I share my photos with clients in a secure way (I use Pixieset.com), and trust that they’re not sharing my full-sized photos with tons of people.
I watermark photos that are going online, partly for “copyright” purposes, and partly for advertisement.