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The spectral tools calculate from seven data tables published by the International Commission on Illumination (CIE), © CIE, each released under the Creative Commons Attribution-ShareAlike 4.0 International licence (CC BY-SA 4.0):
What was changed. The CIE publishes each table at 1 nm intervals. Colourwise reduced each to 36 values, one per 10 nm band from 380 to 730 nm, by averaging the published values within the band. Nothing else was altered. The CIE has not reviewed or endorsed these reduced tables or anything calculated from them.
What share-alike covers. Those reduced tables are adaptations of the CIE’s data, so Colourwise makes them available under the same licence, CC BY-SA 4.0: you may copy and adapt them provided you credit the CIE, say what you changed, and release your own adaptation under the same licence or one Creative Commons lists as compatible with it. That licence applies to the reduced tables only. It does not extend to the rest of Colourwise — the text, the tools, the software and the other datasets are not adaptations of the CIE’s tables and remain subject to the terms above.
The measured reflectance spectra in the spectral explorer are from the U.S. Geological Survey’s Digital Spectral Library (splib05a, Open-File Report 03-395, doi:10.3133/ofr03395), a work of the US Government in the public domain. They were reduced to the same 10 nm bands in the same way.