This is the license statement from the top of all original source files:
Each of the companies; Qualcomm, and Lucent (hereinafter referred to individually as "Source" or collectively as "Sources") do hereby state:
To the extent to which the Source(s) may legally and freely do so, the Source(s), upon submission of a Contribution, grant(s) a free, irrevocable, non-exclusive, license to the Third Generation Partnership Project 2 (3GPP2) and its Organizational Partners: ARIB, CCSA, TIA, TTA, and TTC, under the Source's copyright or copyright license rights in the Contribution, to, in whole or in part, copy, make derivative works, perform, display and distribute the Contribution and derivative works thereof consistent with 3GPP2's and each Organizational Partner's policies and procedures, with the right to (i) sublicense the foregoing rights consistent with 3GPP2's and each Organizational Partner's policies and procedures and (ii) copyright and sell, if applicable) in 3GPP2's name or each Organizational Partner's name any 3GPP2 or transposed Publication even though this Publication may contain the Contribution or a derivative work thereof. The Contribution shall disclose any known limitations on the Source's rights to license as herein provided.
When a Contribution is submitted by the Source(s) to assist the formulating groups of 3GPP2 or any of its Organizational Partners, it is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on the Source(s). The Source(s) specifically reserve(s) the right to amend or modify the material contained in the Contribution. Nothing contained in the Contribution shall, except as herein expressly provided, be construed as conferring by implication, estoppel or otherwise, any license or right under (i) any existing or later issuing patent, whether or not the use of information in the document necessarily employs an invention of any existing or later issued patent, (ii) any copyright, (iii) any trademark, or (iv) any other intellectual property right.
With respect to the Software necessary for the practice of any or all Normative portions of the QCELP-13 Variable Rate Speech Codec as it exists on the date of submittal of this form, should the QCELP-13 be approved as a Specification or Report by 3GPP2, or as a transposed Standard by any of the 3GPP2's Organizational Partners, the Source(s) state(s) that a worldwide license to reproduce, use and distribute the Software, the license rights to which are held by the Source(s), will be made available to applicants under terms and conditions that are reasonable and non-discriminatory, which may include monetary compensation, and only to the extent necessary for the practice of any or all of the Normative portions of the QCELP-13 or the field of use of practice of the QCELP-13 Specification, Report, or Standard. The statement contained above is irrevocable and shall be binding upon the Source(s). In the event the rights of the Source(s) in and to copyright or copyright license rights subject to such commitment are assigned or transferred, the Source(s) shall notify the assignee or transferee of the existence of such commitments.
In addition, the 3gpp2.org website notes:
This download (on the preceding page) may contain licensed code that may contain Intellectual Property (IP) of one or more companies or individuals. Those seeking to reproduce, implement, modify, or otherwise use the code in whole or in part are asked to contact the licensors and IP holder directly. The 3GPP2 Secretariat is not able to provide information regarding the licensing of this code, terms of its use, or information on how to contact companies or individuals who may claim IP in the code included in this file.
My small modifications, mostly in the new file code/io_qcp.c, are MIT-licensed.