[groovico]

I would stay well clear of anything that requires the user to have flash/ java etc installed, many company security settings block these things which means your images wouldnt show at all.

Balinors suggestion of image watermarking is the best method as it involves work beyond just saving.

I haven't come across any image protection which can't be worked around without a few tools or smart techniques.

Water marks make it a pain to rip off.