One of the most effective ways to deter sharing is to add a watermark to the document, preferably with the buyer's name, email address, or a unique ID.
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In this blog we'll cover: How to protect a PDF from being shared in Adobe Acrobat; How to make a PDF unshareable; How to stop sharing with Locklizard DRM; How ...
I know there's no fully sure way of preventing this but is there at least a way of somewhat deterring people from sharing it or removing the share option?