You can show your custom message when user tries to right click on your webpage. Even you can disable the custom message.
For Support and queries regarding Right Click Disable, you can open a ticket at http://support.infyways.com
Thank you for your review.
Regarding content being copied there are many ways to copy the content.
We can't change the property of a browser using a extension.There are no ways to manipulate the property of a browser or an addon of a browser to stop copying any content from the webpage.