What is the best software/company to use when creating a watermark on pfd/Dwg, so that it can't be removed?
We have various drawings that we need to send to clients, but the intellectual property on the drawings is highly sensitive and we don't want it being replicated. What is the best way to create a watermark that can't be removed? What is the best software/company to use? (don't trust free versions).
Adobe Acrobat is good at watermarking documents as described here ...
Then you must protect your PDF documents from being edited (which would allow removal of the watermark)
So, I suggest that you use the Professional version of Adobe Acrobat.
Be aware of the difference between Stamps and Watermarks when working with PDFs.