- Artikel-29-Datenschutzgruppe, Stellungnahme 03/2013 zur Zweckbindung, angenommen am 2. April 2013 (WP 203). Unter: https://ec.europa.eu/justice/article-29/documentation/opinion-recommendation/files/2013/wp203_en.pdf
- ICO: Principle (b): Purpose limitation. Unter: https://ico.org.uk/for-organisations/guide-to-data-protection/guide-to-the-general-data-protection-regulation-DSGVO/principles/purpose-limitation/
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