CC-BY-SA-2.5-ES. This picture was taken in Malta, where it is not an infrigment of copyright laws to reproduce art works diplayed in the public space: See the Maltese law.
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to remix – to adapt the work
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attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.