Ok after reading a thread that had something to do with this it got me thinking. At the end of last year I covered a beauty contest, and after it ended some contestants asked me for photos to take home. It all happened very quickly, and since the event I covered was not for them but for the agency that made it, I got cought off guard so I charged them a low rate. Trying to correct the low charge I didn't give them Full size jpegs. I lowered the print size so all the jpegs were 4 x 6 inches and the resolution was 150 dpi. Now I'm not that sure that by doing that I secured that they could only print a 4 x 6. I want to know if there is a way of giving digital media to your client with the peace of mind that if they try to enlarge it they will get a low quality result if they print it in a larger size than the one I gave them. I usually work with prints so i don't have that problem, but in case they want a cd with jpegs next time I can give one and be sure that all they can get out of it are prints to the size i give them. My experience with photoshop has been mostly with graphic design work and photo retouching but I never experimented with limiting resolutions for printing.