---
title: "Case C-77/21: judgment of 20 October 2022"
canonical: "https://dposchool.com/gdpr/case/c-77-21"
source: "https://curia.europa.eu/juris/liste.jsf?num=C-77/21&language=en"
source_note: "Only the judgment as published by the Court of Justice is authoritative."
text_as_of: "2026-10-28"
last_reviewed: "2026-10-29"
language: "en"
publisher: "DPO School"
---

Court of Justice judgment · Case C-77/21

# Digi Távközlési és Szolgáltató Kft. v Nemzeti Adatvédelmi és Információszabadság Hatóság

[Reviewed by Sergio Maldonado Elvira on 29 October 2026](https://dposchool.com/gdpr/about#review)

- **Case:** C-77/21
- **Court:** Court of Justice
- **Date of judgment:** 20 October 2022
- **ECLI:** ECLI:EU:C:2022:805
- **Instrument:** Regulation (EU) 2016/679 (GDPR)
- **Provisions:** [Article 5(1)(b)](https://dposchool.com/gdpr/article/5#1-b), [Article 5(1)(e)](https://dposchool.com/gdpr/article/5#1-e), [Article 6(4)](https://dposchool.com/gdpr/article/6#4)

## Holding (summary, not the official text)

Copying customer data into a test database can be compatible further processing under Art. 6(4), but keeping the data there longer than needed for testing breaches storage limitation.

## Official source

- [Case C-77/21 on CURIA](https://curia.europa.eu/juris/liste.jsf?num=C-77/21&language=en)
- [Judgment on EUR-Lex (CELEX 62021CJ0077)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:62021CJ0077)

Checked against the official source on 28 October 2026.

Only the judgment as published by the Court of Justice is authoritative. This is reference material, not legal advice.

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