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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
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The reproduction of this work is covered under the article XI.190 of the Code of Economic Law, which states that "Once a work has been lawfully published, its author may not prohibit: [...] 2/1°. reproduction and communication to the public of works of plastic, graphic or architectural art designed to be placed on a permanent basis in public places, provided that the reproduction or the communication of the work is as it is found there and that this reproduction or communication does not infringe upon the normal exploitation of the work and does not cause unreasonable harm to the legitimate interests of the author [...]."
See COM:CRT/Belgium#Freedom of panorama for more information.