need to know if there is a way to add watermarks on downloaded files, this I see very significant to protect my copyright. Anybody who had done this?

the only option to have watermarked downloaded files, is to watermark the original before uploading to zenfolio.

 I concur that having watermarking as a option for downloads would be great. for me, not so much for image protection but for marketing.

You do have the option of allowing images to be saved with a watermark, separate from downloading the original. Once you have enabled this under Customize Visitor View>>Options, the selection will be visible when a viewer moves their mouse over the top left of a photo as well as right-clicks on a photo.

The file sizes you can offer are directly linked to the maximum display sizes you have enabled in Access Control. If you limit the display size to Small then the only size that will be available to save will be up to 400 pixels on the longest side. Alternatively if you enable Large or Very Large display sizes the Save options will follow accordingly.

Note: If you have a watermark applied it will be downloaded with the image.

Check out the Help section on display sizes for more information on exact sizes.

To allow saving of smaller images

1. In Edit View, select the Gallery you would like to edit
2. Locate the Show Visitor View » Customize link in the Top Menu of the Main Area. If you are already in the Visitor View, move your mouse over the My Zenfolio View Switcher at the top of the visitor page. A menu will open with a list of items. Click to select Customize Visitor View.
3. Click to open a photo page
4. Select Options from the top menu. A popup window will open.
5. If Use Default Settings option is checked, click to uncheck it to access custom settings.
6. Next to Option to Save Images click Show
7. Click Apply to confirm and apply the selection.

I hope this works as a work-around for now.