Without an open license, an educational resource can be freely accessible without being "open". Indeed, the concept of openness goes far beyond price. As we saw in the previous module, an open educational resource can not only be used free of charge, but it can also be reproduced, revised, remixed and redistributed without asking permission from the copyright holders (see the 5Rs of OER).
It is therefore essential to understand how open licenses work, to recognize them on existing resources and to apply them correctly on your own content to encourage sharing and reuse.