Downloads from my zencart previews???

I've just been notified that customers/visitors to my store are able to download my digital products not by paying for them as normal but by simply clicking on the preview images!!! How can this be and how do I stop this!

I sell digital downloadable products and downloads should only be possible after payment has been made and should not be downloadable by simply clicking on the preview image of the product in my store.

Please advise asap.

Zen Cart doesn't work that way, unless you put your actual finished products as the product-images in your store.

ie: If your preview image is the actual product then naturally anyone can just click right and download ...

You should really be using a small sample image or one with a watermark for your Product and listings and not the real product image ...