What is the best way to protect my PDF eBook?

I made a PDF from a Microsoft Word document. So far so good. Now what is the best way to protect my PDF eBook to ensure I don’t get thousands of unauthorized copies of my PDF eBook floating around the internet?

I don’t want to use a simple password to protect the PDF document, because judging by the amount of unauthorized PDF copies of other eBooks I have seen available on the internet, that security method is very weak.

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