Note the licensing note in the repository[1] of the APCA™ index the author’s company[2] promotes:
> The files currently in this repository are presently considered pre-release, and as such do not have a permanent license attached. In this repositiory, all files present are under a time-barred beta license, and intended for use with web-based content only, and not for any other use without written permission.
The non-pre-release stuff[3] offered to W3C is better but still seems to be intended to end up non-FOSS:
> Files in this repository are licensed to the W3/AGWG under their cooperative agreement for use with WCAG accessibility guidelines for web-based content only, and not for any other use.
Similarly, the online calculators[4,5] referenced in the author’s posts (not this one) are
> PROPRIETARY AND NOT LICENSED FOR THIRD PARTY USE.
(The question being, of course, how much of this is copyrightable at all and to what extent these terms are just sowing legal FUD.)
Not that it's relevant to this thread, and I have clarified this elsewhere:
This is destined as open source. The only reason the public beta has a time limited license is to make it clear that the pre-release materials needs to be discarded once it's stable and in release. BECAUSE this is destined to be part of various standards, it is important to prevent "wrong versions" from circulating (to the degree possible) this has already caused problems, hence the current temporary license.
Any developer that wants a longer term license only needs to request it, so that we can have contact and follow through on changes.
> The files currently in this repository are presently considered pre-release, and as such do not have a permanent license attached. In this repositiory, all files present are under a time-barred beta license, and intended for use with web-based content only, and not for any other use without written permission.
The non-pre-release stuff[3] offered to W3C is better but still seems to be intended to end up non-FOSS:
> Files in this repository are licensed to the W3/AGWG under their cooperative agreement for use with WCAG accessibility guidelines for web-based content only, and not for any other use.
Similarly, the online calculators[4,5] referenced in the author’s posts (not this one) are
> PROPRIETARY AND NOT LICENSED FOR THIRD PARTY USE.
(The question being, of course, how much of this is copyrightable at all and to what extent these terms are just sowing legal FUD.)
[1] https://github.com/Myndex/SAPC-APCA/
[2] https://www.myndex.com/CVD/
[3] https://github.com/Myndex/apca-w3/
[4] https://www.myndex.com/APCA/
[5] https://www.myndex.com/BPCA/