L4LOD (Licenses for Linked Open Data) is a lightweight vocabulary for expressing the licensing terms in the Web of Data. The vocabulary is not intended to propose yet another license, but it is intended to provide the basic means to define in a machine-readable format, i.e., RDF, the existing licensing terms. The vocabulary does not provide an exhaustive set of properties for licenses definition. Implementations are free to extend L4LOD to add further elements.