Open Data

Expose data with open and standard formats under non-restrictive use licenses so that anyone can access and reuse them. [Decalogue of the public sector data reuse]

Initiative for the opening of data suitable for reuse by third parties [TSI-RPSI Application Guide]

It is a philosophy and practice that pursues that certain types of data are freely available for everyone, without restrictions of copyrights, patents or other control mechanisms. [Wikipedia]