# 著作権法 / Copyright Act — 第五十二条 (Article 52)

- Law: 著作権法 (Copyright Act), 昭和四十五年法律第四十八号
- English title "Copyright Act": Ministry of Justice translation
- Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say.
- Provision: 第五十二条 (Article 52)（無名又は変名の著作物の保護期間） — address `art-52`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/ja/copyright-act/art-52
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/345AC0000000048/art-52
- Every provision below carries its address and both URLs on the line under it.
- Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below.

Only the Japanese as published by the government has legal effect; the text
below is a copy of it. Every English rendering below is a translation and
says which kind: the Ministry of Justice's translation, or this
site's machine translation, whose model and date the Sources list names.
They are never merged and never substituted for one another.

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### 第五十二条（無名又は変名の著作物の保護期間） — (Terms of Protection for Anonymous or Pseudonymous Works)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-52 · https://japanlaw.org/ja/copyright-act/art-52 · https://japanlaw.org/l/345AC0000000048/art-52</sup>

  **第一項**  無名又は変名の著作物の著作権は、その著作物の公表後七十年を経過するまでの間、存続する。ただし、その存続期間の満了前にその著作者の死後七十年を経過していると認められる無名又は変名の著作物の著作権は、その著作者の死後七十年を経過したと認められる時において、消滅したものとする。
  <sup>art-52/par-1 · https://japanlaw.org/ja/copyright-act/art-52/par-1 · https://japanlaw.org/l/345AC0000000048/art-52/par-1</sup>
  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.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

  **第二項**  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。
  <sup>art-52/par-2 · https://japanlaw.org/ja/copyright-act/art-52/par-2 · https://japanlaw.org/l/345AC0000000048/art-52/par-2</sup>
  The provisions of the preceding paragraph do not apply in any of the following cases:
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

    **一**  変名の著作物における著作者の変名がその者のものとして周知のものであるとき。
    <sup>art-52/par-2/item-1 · https://japanlaw.org/ja/copyright-act/art-52/par-2/item-1 · https://japanlaw.org/l/345AC0000000048/art-52/par-2/item-1</sup>
    the pseudonym adopted by the author of a pseudonymous work is commonly known to be that author's pseudonym;
    <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

    **二**  前項の期間内に第七十五条第一項の実名の登録があつたとき。
    <sup>art-52/par-2/item-2 · https://japanlaw.org/ja/copyright-act/art-52/par-2/item-2 · https://japanlaw.org/l/345AC0000000048/art-52/par-2/item-2</sup>
    the author's true name is registered pursuant to Article 75, paragraph (1), within the period referred to in the preceding paragraph;
    <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

    **三**  著作者が前項の期間内にその実名又は周知の変名を著作者名として表示してその著作物を公表したとき。
    <sup>art-52/par-2/item-3 · https://japanlaw.org/ja/copyright-act/art-52/par-2/item-3 · https://japanlaw.org/l/345AC0000000048/art-52/par-2/item-3</sup>
    the author makes the work public using the author's true name or the pseudonym by which the author is commonly known to indicate the name of the author, within the period referred to in the preceding paragraph.
    <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

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## Cites
- art-52/par-2: 前項 → 著作権法 第五十二条第一項 (Article 52, paragraph (1)), art-52/par-1 — https://japanlaw.org/ja/copyright-act/art-52/par-1 · https://japanlaw.org/l/345AC0000000048/art-52/par-1
- art-52/par-2/item-2: 前項 → 著作権法 第五十二条第一項 (Article 52, paragraph (1)), art-52/par-1 — https://japanlaw.org/ja/copyright-act/art-52/par-1 · https://japanlaw.org/l/345AC0000000048/art-52/par-1
- art-52/par-2/item-2: 第七十五条第一項 → 著作権法 第七十五条第一項 (Article 75, paragraph (1)), art-75/par-1 — https://japanlaw.org/ja/copyright-act/art-75/par-1 · https://japanlaw.org/l/345AC0000000048/art-75/par-1
- art-52/par-2/item-3: 前項 → 著作権法 第五十二条第一項 (Article 52, paragraph (1)), art-52/par-1 — https://japanlaw.org/ja/copyright-act/art-52/par-1 · https://japanlaw.org/l/345AC0000000048/art-52/par-1

## Cited by

10 provisions cite this one. No official source publishes this direction.

- 著作権法 第五十一条第二項（保護期間の原則） — https://japanlaw.org/ja/copyright-act/art-51/par-2 · https://japanlaw.org/l/345AC0000000048/art-51/par-2
- 著作権法 第五十二条第二項（無名又は変名の著作物の保護期間） — https://japanlaw.org/ja/copyright-act/art-52/par-2 · https://japanlaw.org/l/345AC0000000048/art-52/par-2
- 著作権法 第五十二条第二項第二号（無名又は変名の著作物の保護期間） — https://japanlaw.org/ja/copyright-act/art-52/par-2/item-2 · https://japanlaw.org/l/345AC0000000048/art-52/par-2/item-2
- 著作権法 第五十二条第二項第三号（無名又は変名の著作物の保護期間） — https://japanlaw.org/ja/copyright-act/art-52/par-2/item-3 · https://japanlaw.org/l/345AC0000000048/art-52/par-2/item-3
- 著作権法 第五十四条第三項（映画の著作物の保護期間） — https://japanlaw.org/ja/copyright-act/art-54/par-3 · https://japanlaw.org/l/345AC0000000048/art-54/par-3
- 著作権法 第五十六条第一項（継続的刊行物等の公表の時） — https://japanlaw.org/ja/copyright-act/art-56/par-1 · https://japanlaw.org/l/345AC0000000048/art-56/par-1
- 著作権法 第五十七条第一項（保護期間の計算方法） — https://japanlaw.org/ja/copyright-act/art-57/par-1 · https://japanlaw.org/l/345AC0000000048/art-57/par-1
- 著作権法 第五十八条第一項（保護期間の特例） — https://japanlaw.org/ja/copyright-act/art-58/par-1 · https://japanlaw.org/l/345AC0000000048/art-58/par-1
- 著作権法 附則第十条第二項（合著作物についての経過措置） — https://japanlaw.org/ja/copyright-act/suppl-3451-48/art-10/par-2 · https://japanlaw.org/l/345AC0000000048/suppl-3451-48/art-10/par-2
- 著作権法 附則第七条第一項（著作権法の一部改正に伴う経過措置） — https://japanlaw.org/ja/copyright-act/suppl-4281-108/art-7/par-1 · https://japanlaw.org/l/345AC0000000048/suppl-4281-108/art-7/par-1

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## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 著作権法 — the text in force from 2026-06-24 (https://laws.e-gov.go.jp/law/345AC0000000048/20260624_508AC0000000048), retrieved 2026-10-19
- Japanese Law Translation Database System, Ministry of Justice (法務省) — Copyright Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/4207/tb), retrieved 2026-10-19
- This site's parser, version 210 — 著作権法 — structure, counts, cross-references and defined terms, computed 2026-10-19