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	The copyright holder of this file allows anyone to use it for any purpose, provided that you adhere to the Boost Software License 1.0 (Free software license without Copyleft).
	Please check that the conditions given above are compliant to the Commons licensing policy. Most importantly, derivative work and commercial use must be allowed. Česky | Dansk | Deutsch | English | Español | فارسی | Français | Italiano | 日本語 | 한국어 | Kurdî / كوردی | Nederlands | Polski | Português | Русский | Svenska | Türkçe | 中文 | ‪中文(台灣)‬ | +/-

The license is not specified in the file but there is this information text:

Unless otherwise specified, all Boost software and documentation is subject
to the Boost Software License Version 1.0. See the accompanying file LICENSE_1_0.txt.
A copy of the license is also available at http://www.boost.org/LICENSE_1_0.txt.

So even though it is a logo, it is part of the documentation and thus should be considered subject to the given license.

License text (classifies as "free software", much like the BSD License):

Boost Software License - Version 1.0 - August 17th, 2003

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:

The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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