This image, originally posted to Flickr, was reviewed on 12 May 2013 by the administrator or reviewerAlan, who confirmed that it was available on Flickr under the stated license on that date.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
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.
This work prominently depicts a work of illegal graffiti which might not be in the public domain and has not been released under a free license.
Occasionally graffiti will be kept, using the claim that an author might be rejected any copyright relief based on an illegal act; however, there is no evidence of this legal theory being tested. See Commons:Copyright rules by subject matter#Graffiti.
Official Commons policy is Commons:Project scope/Precautionary principle, which declines claims such as "The copyright owner will not bother to sue or cannot afford to." or "Nobody knows who the copyright owner is".
Complex understanding of the law may be required to determine whether the graffiti in this work would actually be eligible for copyright enforcement.