You can remove watermarks on your own!
Edit a master object
To edit or delete a master object, first make it selectable.
Object selected, showing master object selection handles
Choose Arrange > Section Masters > Make Master Objects Selectable (from the Arrange menu at the top of your screen).
Do one of the following:
Remove the object completely: Press Delete.
Lock master objects after editing: Deselect Make Master Objects Selectable so master objects can’t be moved or deleted by accident.
Keep the object but remove it as a master object: Choose Arrange > Section Masters > Move Object to Page.
You can also copy the entire resource and paste it on a new page in a Word processing document and that will remove the watermark.