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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 1.1 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 at
+ Documentation/userspace-api/media/fdl-appendix.rst.
+
+ TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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