A Learning Object (LO) is, by definition, a reusable chunk of learning content: the reusability is the main motivation in favour of LOs. But if an LO is covered by copyright, it can be reused from the technical point of view, but legally it is only reusable by the owner. The SLOOP Project introduced the idea of free or open Learning Object: an LO with a licence that allows the material to be used freely, to be changed and to be distributed.