2. A data controller shall take reasonable measures to ensure that any data processor that processes personal data with respect to which the former is a data controller: a) carries out its processing in a manner that ensures the data controller’s compliance with this Law; b) provides all notifications, information and assistance reasonably required for the data controller to comply and demonstrate compliance with this Law; c) meets the requirements of article 24 as if it applied to data processors; and d) keeps a record and promptly notifies the data controller of any personal data breach, including the facts relating to a personal data breach, its effects and any remedial actions taken. 3. Reasonable measures under sub-article 2 include a written agreement between the data controller and each data processor it directly engages, including a contractual requirement in that agreement that the data processor shall ensure that all further data processors that may be engaged enter into a similar written agreement. 4. All references in this Law to processing of personal data by a data controller shall include processing by a data processor of any personal data with respect to which the former is the data controller, and the data controller shall be responsible for compliance of such processing with this Law. CHAPTER IV—RIGHTS OF A DATA SUBJECT Article 20: Rights of confirmation, access, correction and deletion 1. Subject to sub-article 1, a data subject has the right to obtain from a data controller for reasonable purposes, at no expense and without unreasonable delay: a) confirmation as to whether or not the data controller is processing personal data relating to the data subject and the source of such personal data; b) a copy of such personal data in a commonly used electronic format; c) correction, or if correction is not feasible or suitable, deletion of any such personal data that is inaccurate, out of date, incomplete or misleading; and d) deletion of any such personal data which the data controller is not entitled to retain. 17