You can now assign a separate watermark that can be applied to your digital files when they are sold. This means you can use a different watermark to the ones you apply to your public galleries.
Here's how you can apply a watermark to a Digital Download product.
1. Make sure you have your Watermark configured the way you want it to appear on your images. Check out the watermarking tutorial here.
2. Edit the Digital Download product you would like to apply the watermark to. Go into Store / Product / Tab: Digital / Edit: Product (click the name of the digital product
3. Choose from your available watermarks and then save.
here's a link to a screenshot: http://cl.ly/image/1s0t411L2x3d