Sharepoint and Watermarking

Fred has put up a lot of photos and documents on Sharepoint, including pictures of drawings and artifacts that are for sale. I've managed to modify some of them in the Watermark folder by adding a watermark to them saying "AVRO MUSEUM" at Fred's suggestion, to dissuade people from downloading the images for free. Well they can still download them, but now they have the museum name across them

I've done the images with Corel Paintshop Pro, for the PDF documents I have found that FreePDF, which is a free download from Softmaker.com, allows not only PDF viewing but modifications such as the addition of text boxes, so I've been able to use that to apply watermarks to those files as well.