Protect any image by a PNG watermark.
How to use (for non programmers):
You should de-zip the https://github.com/logical-and/prestashop-watermark/archive/master.zip and then, important, repack it like this:
- de-zip the master.zip
- go into the new folder until you see all the files
- go back one level
- rename 'prestashop-watermark-master' to 'watermark'
- zip (repack) this folder and you will get a zip called: watermark.zip
- install as usual
- Enjoy. :)