The license (if one can speak of a license at all, the page is not
clear that it is a license agreement) do not appear to be perpetual,
and it seem to restrict implementation to be unmodified Camellia.
I guess their intention is to protect their hardware version of
Camellia implementation because they build not only software version
but also hardware version of Camellia.
As far as I know, Japanese version of patent law is very limited on
Software. It is very different from US patent law situation. NTT is
a Japanese company and NTT speaks in Japanese context.
We can get GPL, BSD License and others version of Camellia source code
that are provided by NTT that is Camellia's patenter. This Camellia
code is well tuned up and runs very fast. It is not sort of sample
code.
http://info.isl.ntt.co.jp/crypt/eng/camellia/source.html
If we can NOT use, copy, modify, and redistribute it, that is a sort
of license violation against GPL by the original licenser. I believe
NTT knows what GPL is.
Regards,
---
Hironobu SUZUKI <hironobu at h2np dot net><hironobu at fsij dot org>
Hironobu SUZUKI Office, Inc. / FSIJ / WCLSCAN / OpenPKSD
Tokyo, Japan.
http://h2np.net