Change the filename of the pictures like this : img_name_by_author_name

[protox]

Don't know if it's hard to code or not ..
... but this could be interesting to notice downloaders / leechers that the picture has been made by someone .. yeah !

[kegobeer]

If you want to name your pictures like that, do it before you upload them.  Do you really think that will have any effect on someone who leeches files?

Sorry, denied.