Demonstrate consent
107. It is up to the controller to prove that valid consent was obtained from the data subject. The GDPR does not prescribe exactly how this must be done. However, the controller must be able to prove that a data subject in a given case has consented. As long as a data processing activity in question lasts, the obligation to demonstrate consent exists. After the processing activity ends, proof of consent should be kept no longer then strictly necessary for compliance with a legal obligation or for the establishment, exercise or defence of legal claims, in accordance with Article 17(3)(b) and (e).
(EN) ISO/IEC 27701, adopted in 2019, added additional ISO/IEC 27002 guidance for PII controllers.
Here is the relevant paragraph to article 7(3) GDPR:
7.3.4 Providing mechanism to modify or withdraw consent
Control
The organization should provide a mechanism for PII principals to modify or withdraw their consent.
Implementation guidance
The organization should inform PII principals of their rights related to withdrawing consent (which may vary by jurisdiction) at any time, and provide the mechanism to do so.
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