Comment 12 for bug 341367

CELT is BSD license, as shown in celtcodec.c:
static struct PluginCodec_information licenseInfo = {
    // Fri Dec 13 2008, 23:37:31 CET =
    1229729851,

    "Stefan Knoblich, axsentis GmbH", // source code author
    "0.1", // source code version
    "<email address hidden>", // source code email
    "http://oss.axsentis.de/", // source code URL
    "Copyright (C) 2008 axsentis GmbH", // source code copyright
    "BSD license", // source code license
    PluginCodec_License_BSD, // source code license

    "CELT (ultra-low delay audio codec)", // codec description
    "Jean-Marc Valin, Xiph Foundation.", // codec author
    "", // codec version
    "<email address hidden>", // codec email
    "http://www.celt-codec.org", // codec URL
    "(C) 2008 Xiph.Org Foundation, All Rights Reserved", // codec copyright information
    "Xiph BSD license", // codec license
    PluginCodec_License_BSD // codec license code
};