WordPress/wp-includes/ID3/license.txt

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/// getID3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or https://www.getid3.org                        //
//          also https://github.com/JamesHeinrich/getID3       //
/////////////////////////////////////////////////////////////////

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   getID3() is released under multiple licenses. You may choose
   from the following licenses, and use getID3 according to the
   terms of the license most suitable to your project.

GNU GPL: https://gnu.org/licenses/gpl.html                   (v3)
         https://gnu.org/licenses/old-licenses/gpl-2.0.html  (v2)
         https://gnu.org/licenses/old-licenses/gpl-1.0.html  (v1)

GNU LGPL: https://gnu.org/licenses/lgpl.html                 (v3)

Mozilla MPL: https://www.mozilla.org/MPL/2.0/                (v2)

getID3 Commercial License: https://www.getid3.org/#gCL
(no longer available, existing licenses remain valid)

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Copies of each of the above licenses are included in the 'licenses'
directory of the getID3 distribution.