'Unrestricted stock can be used for both personal and commercial projects, but it cannot be redistributed as stock. You are not required to obtain permission prior to using the stock off site or in DA prints. The only requirements are that the stock provider be notified and credited.'
~ Unrestricted Stock Directory
My stock is unrestricted, so you can use it in;
secrets for DeviantArtSecret;
without notifying me beforehand.
You can use them for whatever you want, except to re-upload them as stock or photography. You are allowed to make new stock with my stock, but be creative, please. Using my stock as a reference is also allowed, of course
You have to credit me, though, whatever you choose to do.
Furthermore, I would like to be notified when you've used one of my resources. You can comment on the deviation, comment on my userpage or sent me a note; whatever works for you.
I'd love to see the things you've made!
Off-site usage is allowed. A credit link is very much appreciated, but not a necessity, because I understand it's not always possible. You have to show me where you've used it, though.
You may use my stock to practice your photoshop skills and do simple things, like messing around with filters or something like that. However, when you want to submit your deviation as a print or use it in other commercial use, every use of my resources must consist of substantial manipulation.
Feel free to note me or send a comment my way if you have any questions about anything. I have to be strict about these rules, but I'm a nice person, no worries.
Have fun with being creative!