Watermarks are visible embedded overlay on a digital photo consisting of text, a logo, or a copyright notice that discourages others from taking your digital images and using them without your permission.

In the example below this png image is used as a watermark for the iPhone photos.
To implement such a possibility, it is necessary to provide some event handlers. Technical details are as follows (click a link below to see the appropriate code):

- OnBeforePageExecute event handler code.
- OnCustomRenderColumn event handler code.