40The GDPR does not contain any provision intended to define the rules on the assessment of the damages to which a data subject, within the meaning of Article 4(1) of that regulation, may be entitled under Article 82 thereof, where an infringement of that regulation has caused him or her harm. Therefore, in the absence of rules of EU law governing the matter, it is for the legal system of each Member State to prescribe the detailed rules governing actions for safeguarding rights which individuals derive from Article 82 and, in particular, the criteria for determining the extent of the compensation payable in that context, subject to compliance with the principles of equivalence and effectiveness (judgments of 4 May 2023, Österreichische Post (Non-material damage in connection with the processing of personal data), C‑300/21, EU:C:2023:370, paragraph 54, and of 11 April 2024, juris, C‑741/21, EU:C:2024:288, paragraph 58).