Highslide Image Watermarking
 

I'm thinking about buying the Pro version, but I had a question about the watermarking that appears when you click on an image in Highslide. Is that stuff removable so it just shows the image and no watermarking?

Yes, you can choose to show or not show a watermark. There is a screenshot here of the ACP watermark setting. If you do choose to show a watermark, you specify the image to use for the watermark.