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Google's spidering of images and PDF's taught me some valuable lessons.
After way too many hits of a google listing of an JPG which had a name?
I moved ALL my images to a robots.text disallow folder and numbered all images and pdf's numerically.
It has and does create some extra work, however the result has been almost ZILCH for links to images.
BTW most of my PDF's are 128 bit encryted any way. It doesn't do them much good. The down side is that it results in visitors reloading the PDF's because the printing and cut and paste are turned off.