It makes no sense to cite a little part of the US DMCA law if the discussion was based on Japanese laws. If you look at https://www.law.cornell.edu/uscode/text/17/1201 , its much more complicated than one sentence. As for the DMCA, this is the next paragraph after the cited above one:

(B) The prohibition contained in subparagraph (A) shall not apply to persons who are users of a copyrighted work which is in a particular class of works, if such persons are, or are likely to be in the succeeding 3-year period, adversely affected by virtue of such prohibition in their ability to make noninfringing uses of that particular class of works under this title, as determined under subparagraph ©.

I admit not really to understand, as the language is hard to read for me. It would even be hard in my native language. Does the Japanese law have such clauses and exceptions?