Europol Public Information  18. The duration of processing of  Personal data  by the  Contractor  will not exceed the period referred to  in Article II-24.2 of the FWC. Upon expiry of this period, the  Contractor  shall, at the choice of the  Data controller , return, without any undue delay in a commonly agreed format, all personal data  processed on behalf of the  Data controller and the copies thereof or shall effectively delete all  Personal data  unless Union or national law requires a longer storage of such  Personal data .  19. The  Contractor shall not engage another sub-contractor without prior specific or general written  authorisation of Europol, as specified in Article II-19 (“Subcontracting”). In the case of general  written authorisation, the  Data processor  shall inform Europol of any intended changes concerning  the addition or replacement of other processors, thereby giving Europol the opportunity to object to  such changes. The  Contractor  is responsible for passing on the obligations in this Article to its sub- contractors and for ensuring compliance with such obligations by its sub-contractors. If any  evidence of compliance by sub-contractors with this Article is requested by Europol, the  Contractor shall be responsible for obtaining it.  20. For the purpose of Article II-19 of this FWC, if part or all of the processing of  Personal data is  subcontracted to a third party, the  Contractor  shall pass on the obligations referred to in II.17.1 and  II.17.2 in writing to those parties, including sub-contractors. At the request of Europol, the  Contractor  shall provide a document providing evidence of this commitment.  21. The Parties agree to cooperate in good faith to modify these provisions by Addendum to the  Framework Contract  in the event that the European Commission adopts further standard contractual clauses for data protection by implementing decision which impact on intra-EU and  intra-EEA transfers of  Personal data .  1. If either party is faced with  Force Majeure , it shall notify the other without delay in writing, stating  the nature, likely duration and foreseeable effects.  2. A party is not liable for any delay or failure to perform its contractual obligations if that delay or  failure is due to  Force Majeure . 3. When faced with  Force Majeure , the  Contractor  shall continue to perform its contractual obligations  as far as is reasonably practicable, and shall seek all reasonable alternative means for performance  of its obligations which are not prevented by the  Force Majeure  event. The  Contractor  shall not put  into effect such alternative means without Europol’s prior written consent. 4. Where the  Contractor is unable to perform its contractual obligations owing to  Force Majeure  (regardless of the party notifying it), it shall have the right to remuneration only for goods  satisfactorily delivered and/or services satisfactorily performed.  1. The  Contractor  may sub-contract the delivery of goods and/or performance of the services to the  sub-contractors listed in its Tender and provided any restrictions specified in the tender stage  documentation are complied with. Sub-contracting to third-parties or in a different manner than  proposed in the  Contractor’s  Tender requires express prior written authorisation from Europol. Page 51 of 79  Europol’s initials:  Contractor’s initials:  Article II-19  Sub-contracting  Article II-18  Force Majeure 