I guess it was a stony road to convince ASCII Corp. to put it on CTAN.
No, it was not that hard :) Actually, they had a plan to do it in near future.
What is the current official license for PTeX? I only found this: http://www.ctan.org/tex-archive/help/Catalogue/licenses.other-free.html (http://www.ctan.org/tex-archive/help/Catalogue/entries/ptex.html)
Its license is the BSD license: http://www.ctan.org/tex-archive/language/japanese/ptex/COPYRIGHT
I did this now.
Thank you very much :) Koji