Published under the "GNU Free Documentation License" and the "Creative Commons Attribution ShareAlike license". Citations from the license agreement:
GNU:"[...] The current 1.2 version of the license allows the material licensed under it to be used for any purpose, but under a set of guidelines; the authors of the work must be attributed [...]"
CC:"[...] You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work) [...]"
in short: You must attribute the author.
Licensing
I, the copyright holder of this work, hereby publish it under the following licenses:
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
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.