Contract number: [ complete ]  Service contract conditions of December 2018  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  II.12.2   Any right or obligation assigned by the contractor without authorisation is not  enforceable against the contracting authority.  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.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.11.1  Any amendment to the contract must be made in writing before all contractual  obligations have been fulfilled. 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 . The payment of the price includes any fees payable to the contractor about the acquisition of  ownership of rights by the Union including for all modes of exploitation and of use of the  results .  Unless provided otherwise in the special conditions, the Union 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 Union, which may use the  pre-existing materials  for all the modes of  exploitation set out in this contract. Unless otherwise agreed, the licence is non-transferable  and cannot be sub-licensed, except as provided hereafter:  (a) the  pre-existing rights can be sub-licensed by the contracting authority to persons and  entities working for it or cooperating with it, including contractors and subcontractors,  whether legal or natural persons, but only for the purpose of their mission for the Union; (b) if the  result  is a "document" such as a report or a study, and it is meant to be published, the  existence of  pre-existing materials in the  result may not prevent the publication of the  23 