The code that implements OpenImageIO is licensed under the Apache 2.0 license for all new code contributed after July 1, 2023, and any code from prior to that date which has been relicensed under Apache-2.0 by their owners. Code dating from prior to July 1, 2023 that has not been relicensed by their owners is licensed under the BSD 3-clause (also sometimes known as “new BSD” or “modified BSD”) license.
Version 2.0, January 2004
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OpenImageIO incorporates code from several other software packages with compatible licenses. Copies of their licenses are reproduced here: https://github.com/OpenImageIO/oiio/blob/master/THIRD-PARTY.md