The photographical reproduction of this work is covered under the article § 59 of the German copyright law, which states that "It shall be permissible to reproduce, by painting, drawing, photography or cinematography, works which are permanently located on public ways, streets or places and to distribute and publicly communicate such copies. For works of architecture, this provision shall be applicable only to the external appearance."
As with all other “limits of copyright by legally permitted uses”, no changes to the actual work are permitted under § 62 of the German copyright law (UrhG).
I have published this image as author under the Creative-Commons-Licence CC BY-SA 4.0.. This means that free online usage outside of Wikimedia projects under the following terms of licence is possible:
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.
The copyright is hold by the artist. This work is licensed under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation (http://www.gnu.org/copyleft/fdl.html)