The general confusion around “Open”
# 17 marzo 2011 10:25...most open educational resources are also online educational resources. However, “open” and “available online” are distinct properties of an educational resource, even if they are highly correlated.
... open educational resources are provided free of any cost. But even though free access is a necessary condition of openess, it is not a sufficient one. Consequently, there are many resources that are free but not open.