[summarite]

Europeana is an EU initiative to bring together digital collections of museums, archives, etc from around the EU and make them accessible, findable etc. While they try to encourage everyone to use CC it depends on the organisation that is putting the stuff online, their own rights to it (eg art is often loaned) and how it's put online (commercial photographer or similar might offer to put them for free online in order to be able to sell reuse licenses). So it's a mixed back but last time i checked most seemed to be free to use and share.