skirril - 2:36 pm on May 25, 2001 (gmt 0)

A completely different approach would be:

Do not 'secure' the images as such, but make them unusable in other ways: a 320x200x256 color picture at 75dpi looks good on screen, but won't be of much use when printed. Plus, using eg. jpeg compression will make it small, and virtually uneditable.