My rules are pretty straight forward:
1.) If you use any of my stock, please send me a note or leave a comment with a link to the deviation you used it for - I'd love to see your work! And of course, please credit me in the description with a link back to my page.
2.) This stock (and any manipulations using it) are for non-commercial use only (except by special permission). You may display images using this stock outside of DeviantART, but I'd appreciate it if you'd let me know first. The one exception to the non-commercial rule is selling prints through DA - in this case permission is not needed.
If you have any other questions, please feel free to contact me as well, and enjoy the stock!