The copyright to an anonymous or pseudonymous work subsists for a period of 70 years after the work is made public; provided, however, that if, before the expiration of a duration of copyright for an anonymous or pseudonymous work, it is found that 70 years have elapsed since the death of the author of that work, the copyright is deemed to have expired at the time that is found to constitute the expiration of 70 years since the death of the author.
The provisions of the preceding paragraph do not apply in any of the following cases:
前項の規定は、次の各号のいずれかに該当するときは、適用しない。
the author's true name is registered pursuant to Article 75, paragraph (1), within the period referred to in the preceding paragraph;
Read this with the articles around it