[ Thanks to Dmitri
Popov for this link. ]
“While there are many ways to protect your photos from
unauthorized use, watermarking still remains the simplest and
probably the most effective technique that can help you to identify
you as the creator and make it difficult to use your works without
permission.“Although digiKam supports watermarking, this feature is hidden
so well that you might not even realize that it’s there. This is
because the watermarking function in digiKam is tucked under the
Batch Queue Manager tool which you can use to watermark multiple
photos in one go. Here is how this works in practice. Choose Tools
| Batch Queue Manager (or press the B key) to open the Batch Queue
Manager tool. Drag the photos you want to watermark from a digiKam
album onto the Queues pane to add them to the current queue. Click
on the Base Tools tab in the Batch Tools Available pane and
double-click on the Add Watermark tool to add it to the Assigned
Tools pane.”