II.11 AMENDMENTS  II.12 ASSIGNMENT II.13 INTELLECTUAL PROPERTY RIGHTS  II.13.1 Ownership of the rights in the results  II.13.2 Licensing rights on pre-existing materials  The Contracting Authority acquires irrevocably worldwide ownership of the  results  and of all intellectual  property rights on the newly created materials produced specifically for the Contracting Authority  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  Contracting Authority acquires all the rights as from the moment the contractor has created the  results . The payment of the price includes any fees payable to the contractor about the acquisition of  ownership of rights by the Contracting Authority including for all modes of exploitation and of use of  the  results .  Unless provided otherwise in the special conditions, the Contracting Authority does not acquire  ownership of  pre-existing rights  under this contract.  The contractor licenses the  pre-existing rights  on a royalty-free, non-exclusive and irrevocable basis  to the Contracting Authority, which may use the  pre-existing materials  for all the modes of exploitation  23  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 .  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. 