I despise those idiots who write 7 pages an 1000 rules of usage of their stocks. I got mad because of them and decided to run my own stock images source.
So the one and only rule is: not to sell or redistribute this images as your own.
NO OTHER RULES. I don't give a sh*t if you use them in your prints, commercial works, private galleries. I just don't give a damn. Don't even bother me to ask if you could use them anywhere inside or outside DA.
If you note me where you used it it would be nice, but if you don't - guess what - I don't give a f...
Cheers and have fun!