My tutorials are exclusively for my site only, I would like to keep them here. This also includes not directly linking to them, then it cost me bandwidth. I get 5 e-mails a day from people wanting to translate my tutorials. If you don't have Photoshop, Digimarc can help. Spidering services can be pricey.
Nothing is better proof that that.
You can see the complete list on my About page. Scroll towards bottom on the right. A. Don't have them. I do a lot of shopping on their site. They have the best ones and they look professional.