query re. checkpassword license / public domain status

Hi,

(probably a question for DJB himself but posted here in case list members can 
point me at relevant info I may have missed)

I've been working on a checkpassword-based program to provide bcrypt 
authentication (or potentially other crypt() implementations) which I'm 
looking to release under a free license, but I'm not sure about the underlying 
licensing status of checkpassword:

Whilst most DJB software is now in the public domain,

http://cr.yp.to/distributors.html

checkpassword is not included in that list, making its position ambiguous. In 
the past I've released a couple of checkpassword variants in patch form which 
is a possibility but that feels klunky in today's world.

So I'd love to know: Is checkpassword in the public domain, or if not, what is 
the license for checkpassword?

Best regards,

Andrew Richards.
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