Developing the last Post, this approach uses the same technique but integrates the HighSliding slicing more seamlessly.

The point of this approach is you are in control of what you want to present and at what scale.
At no time does the entire image get published.
So if you only want actual buyers to get the fuller, genuine article, this is a viable approach.

A rip-off merchant would need to knit together a jigsaw of fragments of differing resolutions with missing pieces.
All before you considering watermarking and masking as covered before.

jQuery - HighSlide Copyright Slicing.xar

Acorn