The IPA chart and all its subparts are copyright 2015/2005 by the International Phonetic Association. As of July 2012, they are made freely available under a Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA). This license allows any kind of re-use (including commercial reproduction and derivative works), as long as attribution is given and the reproduction or derivative work is under the same license. See http://creativecommons.org/licenses/by-sa/3.0/ for further description.
Attribution under this license may be made as follows:
"IPA Chart, http://www.internationalphoneticassociation.org/content/ipa-chart, available under a Creative Commons Attribution-Sharealike 3.0 Unported License. Copyright © 2015 International Phonetic Association."
Under this license, there is no need to request permission from the Association for reproduction or re-use. However, if you have further questions, please contact the Secretary.