Designers have been asking how you block so-called “print friendly” websites from stealing your content. This guide should help.
While this won’t work with all of them, it will with some. And it’s also a useful thing to know if you’re running an online business which relies on a website.
Why do we block print friendly websites? Because these websites financially benefit from other people’s content. Instead of the creator potentially receiving ad revenue from their hard work, they strip the content of ads, and then feed ads to their own users, on their own website outside of the print frame.
Notes: i) Please seek a professional if you are not sure. I am not responsible for any action you take. ii) This is a re-posting from a website my husband ran a while ago.
How To Stop Printer Friendly Websites From Working
Step 1. Install Wordfence
Wordfence is a WordPress security plugin. It has many functions, including the ability to block access to your website.
You can find the Wordfence security plugin by searching the WordPress plugin directory (found on your WordPress dashboard Plugins page).

Step 2. Set Up Wordfence, and Optimize The Firewall
Wordfence is a versatile tool, and so can take a bit of time to set up. The Plugin will walk you through the options and explain what it all means.
The important part, is to complete a process called OPTIMIZE THE WORDFENCE FIREWALL. You can find this option by following these steps:
Hover over the Wordfence icon on your WordPress dashboard. Then, select Firewall from the menu available.

Under the tab, Web Application Firewall, which provides a score, click the link called Manage WAF.

On the new page, click OPTIMIZE THE WORDFENCE FIREWALL.

A new box will appear, explaining the process and asking you to download a copy of your website’s .HTACCESS file. Complete the process.

(Note. Access to your .HTACCESS file is required to add the blocking code. For more information about how Wordfence uses access to this file, please refer to their website explanation.)
Step 3. Block The Print Friendly URL (Web Address)
Let’s block those “print friendly” websites.
First, select “Firewall” from the Wordfence menu (as above, on your WordPress dashboard). At the top of the new page, click Blocking, to view the second tab.

Next, in the Create a Blocking Rule tab, choose Custom Pattern.

Now, add the website you want to block into the Hostname bar, as I have done below including the *s (the * means that any variation before or after will not stop the blocking effect):

Replace www.yourprintfriendlywebsite.com, with the website you would like to block.
Also, add a Reason* why you’re blocking this website. It may serve as a useful reminder for you in the future. Something like, “Against T&Cs”. A simple reminder that these actions go against your website’s terms of use (don’t forget to add that to your actual T&Cs page!).
Finally, hit “BLOCK VISITORS MATCHING THIS PATTERN“.

If you scroll down, you’ll now see your new blocking rule.

And, it will count every time it blocks someone from that site, so you can measure its performance.
Did It Work?
When you’re finished, simply pop over to the website you’ve blocked, and try to view your website in their browser.
If you were successful, you should get a message explaining that, “YOUR ACCESS TO THIS SITE HAS BEEN LIMITED BY THE SITE OWNER“.
I hope you have found this post useful!