Ogg Vorbis BSD 3-clause license

The Praat source code contains a copy of the Ogg Vorbis software (see Acknowledgments). Here is the Ogg Vorbis license text:

`Copyright (c) 2002-2020 Xiph.org Foundation
` `
` `Redistribution and use in source and binary forms, with or without
` `modification, are permitted provided that the following conditions
` `are met:
` `
` `- Redistributions of source code must retain the above copyright
` `notice, this list of conditions and the following disclaimer.
` `
` `- Redistributions in binary form must reproduce the above copyright
` `notice, this list of conditions and the following disclaimer in the
` `documentation and/or other materials provided with the distribution.
` `
` `- Neither the name of the Xiph.org Foundation nor the names of its
` `contributors may be used to endorse or promote products derived from
` `this software without specific prior written permission.
` `
` `THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
` ```AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
` `LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
` `A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION
` `OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
` `SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
` `LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
` `DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
` `THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
` `(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
` `OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
`