Official comment
In our humble opinion, doing anything more than the basics to try and protect your content is a fool's errand. Anyone with the slightest intention of circumventing any barriers you put in place will have no problem succeeding. Videos can be downloaded, pdfs can be emailed around, pages can be copied.
Fundamentally, content is very, very hard to protect. How many people share Netflix passwords, for example? (Answer: gazillions)
While there may be plugins to add IP protection or similar, you'd bury yourself in support issues as legitimate clients failed to access their content. And still, if they wanted to share, they'd just call up and say 'i need access at my work IP, too.'
Use that energy to focus on increasing leads and conversions!