About PDF protection

Hello. I am writing a book in Indesign, and planning to export my Indesign content as PDF.

I tried to add protection to my PDF to disable reader from copying my text. But when I upload the PDF to Google Drive and open it, I am able to copy everything.

Since I cannot disable downloading the PDF in the Adobe Document Cloud, what can I do with protecting my PDF content? I do not allow anyone from copying my work and publish it somewhere else. Thank you.