Service contract conditions of December 2018  SUBCONTRACTING  II.10. AMENDMENTS  II.11. ASSIGNMENT II.12. INTELLECTUAL PROPERTY RIGHTS  II.13. Ownership of the rights in the results  II.13.1. II.10.1  The contractor must not subcontract and have the contract performed by third parties  beyond the third parties already mentioned in its tender without prior written  authorisation from the contracting authority.  II.10.2  Even if the contracting authority authorises subcontracting, the contractor remains  bound by its contractual obligations and is solely responsible for the  performance of  this contract .  Contract number: [ complete ]  II.10.3  The contractor must ensure that the subcontract does not affect the rights of the  contracting authority under this contract, particularly those under Articles II.8, II.13  and II.24.  II.10.4  The contracting authority may request the contractor to replace a subcontractor found  to be in a situation provided for in points (d) and (e) of Article II.18.1. II.11.1  Any amendment to the contract must be made in writing before all contractual  obligations have been fulfilled. II.11.2  Any amendment must not make changes to the contract that might alter the initial  conditions of the procurement procedure or result in unequal treatment of tenderers.  II.12.1  The contractor must not assign the rights and obligations arising from the contract,  including claims for payments or factoring, without prior written authorisation from  the contracting authority. In such cases, the contractor must provide the contracting  authority with the identity of the intended assignee.  II.12.2   Any right or obligation assigned by the contractor without authorisation is not  enforceable against the contracting authority.  The Union acquires irrevocably worldwide ownership of the  results and of all intellectual  property rights on the newly created materials produced specifically for the Union under the  contract and incorporated in the  results , without prejudice however to the rules applying to  pre-existing rights  on  pre-existing materials , as per Article II.13.2. The intellectual property rights so acquired include any rights, such as copyright and other  intellectual or industrial property rights, to any of the  results  and in all technological solutions  and information created or produced by the contractor or by its subcontractor in  in  performance of the contract . The contracting authority may exploit and use the acquired  rights as stipulated in this contract. The Union acquires all the rights as from the moment the  contractor has created the  results . 22 