I’ve seen on a few sites *Free Content* but what is the end users rights to these photos?

I read this as these are free to view – Just another portal for people to see what could be inside the site if they pay.

But then I have read a few posts where people say “My free stuff may help you with traffic” This confuses me.

If I was to take a photo or two from a free section I would hear about it from the photos owner.

Could someone help me understand the definition of Free?