Ian Grant
Subscriber
Recently I had a request to buy a print from someone in the EU, I'm not pushing print sales at present due to logisticsm I was told it had been seen on a Blog. (Not sure that's 100% as I can't find that image on the blog but others from the same series have been used). The sale is now pending my printing 
Initial my thoughts were image theft & hot-linking but actually the Canadian site gives full credits and links, so it is fair use, it's also a highly reputable site.
I've since discovered the site has used at least 5 or 6 of my images over the past 2 years, they are copied and usually resized & renamed so it's harder to be certain.
In the past I've found my images hot-linked widely and used in Blogs and other sites, I have a good system for Analysing my sites hits stats, which is quite revealing.
It's important to keep an eye on your sites logs. We can't get stats on APUG of how many visit our own sites from say the Portfolio section here, but the figure is far higher than I'd have guessed, hot linking shows up too, and Referring Sites and there pages are particularly important, they affect your own sites ranking with Google etc.
I'm not totally sre how you police your own images and their use on other internet sites, I've had a policy stated on my sites for at least 5 years that I'll grant free non commercial use on request, and have threatened legal action on about 3 occasions, the last about 5 years ago, which has always resolved the issues.
Unfortunately we need to be aware our images can & will be used by others and keep a watchful eye.
Ian

Initial my thoughts were image theft & hot-linking but actually the Canadian site gives full credits and links, so it is fair use, it's also a highly reputable site.
I've since discovered the site has used at least 5 or 6 of my images over the past 2 years, they are copied and usually resized & renamed so it's harder to be certain.
In the past I've found my images hot-linked widely and used in Blogs and other sites, I have a good system for Analysing my sites hits stats, which is quite revealing.
It's important to keep an eye on your sites logs. We can't get stats on APUG of how many visit our own sites from say the Portfolio section here, but the figure is far higher than I'd have guessed, hot linking shows up too, and Referring Sites and there pages are particularly important, they affect your own sites ranking with Google etc.
I'm not totally sre how you police your own images and their use on other internet sites, I've had a policy stated on my sites for at least 5 years that I'll grant free non commercial use on request, and have threatened legal action on about 3 occasions, the last about 5 years ago, which has always resolved the issues.
Unfortunately we need to be aware our images can & will be used by others and keep a watchful eye.
Ian