Is this doable using the Acrobat SDK? If so, how do I do it?

I am quite new to using the acrobat SDK, so I am wondering what might be the solution here. I have a website and a database that tracks the status of individual published documents, and things obviously change over time and they were made legacy. Is it possible that I dynamically add a watermark with some text saying "Legacy" or something along those lines by dynamically manipulating the file on a client side script based on say, a js array query pulled from the db?