Importance of licensing

In my opinion, it is very important to teach our students that the information they can find on the internet is not always free or that it cannot be used for all purposes; also, that someone has done it before and we must respect his/her work. Licensing their works will help them to understand this.
The license used for this showcase of my e-book allows people to use it and edit it, as long as they do not do it with commercial purposes.
When you see a CCO logo, you should click on it to find out what the author is allowing you to do with his work.