assistance that may reasonably be required, at the contractor’s own and sole expense.  However, the contracting authority reserves the right to decide to conduct its own defence  or to negotiate its own settlement, at its own discretion. The contractor will be responsible  for any payment arising out of any settlement or judgement following such a dispute or  threat, except for the payment of a settlement made by the contracting authority without the  contractor’s written consent. Such consent may not be withheld without reasonable  grounds.  If the infringement of a third party’s  Intellectual property right  on a  Product  and its  Documentation  is declared in a judgement, arbitration sentence or party settlement, or if such  is likely to happen, the contractor agrees to (1) or procure for the contracting authority the  right to continue using the  Product  and its  Documentation , (2) either replace them with  substantially equivalent non-infringing  Products , or, if none of the foregoing is available, (3)  grant to the contracting authority a credit in the amount corresponding to the purchase price  of the proportion of the  Product  which can no longer be used.  The contractor will not be responsible under the present guarantee for any third party  claiming an infringement of its  Intellectual property rights  based on (1) the contracting  authority’s use of  Products  in combination with equipment not delivered by the contractor, if  such combined use is the cause of the claimed infringement, or (2) the contracting authority‘s  use of any  Product  and  Documentation  delivered hereunder in a form other than the one  delivered by the contractor, if such change in form is the cause of the claimed infringement.  IV.2.3.7.  The guarantee against third party claims is due by the contractor until five (5) years following  the end of the framework contract, or until five (5) years following the last use by the  contracting authority of the  Product and its  Documentation delivered by the contractor,  whichever period ends last.  IV.2.4.1.  The contractor undertakes to develop and install the  Products  and provide the  Informatics  Services in accordance with the document: ICT Architecture System and Application  Technical Landscape (Appendix A). The contractor agrees to co-operate with other  suppliers to make the  Products  work with those of these other suppliers. It agrees to attend  meetings called for that purpose by the contracting authority.  IV.2.4.2.  The contractor shall assist and advise the contracting authority on the use of its  Products  and  Services . It shall be responsible for  Product  integration as regards its inclusion in the  framework contract, its operation in the contracting authority’s environment and the  introduction of  New versions .  IV.2.5.1.  Any  Product  delivered under this framework contract shall have been demonstrated by the  contractor, at its expense, to conform to the technical specifications sent to the contractor as  part of the invitation to tender or the negotiation pursuant to which the present framework  contract has been drawn up.  IV.2.5.2.  Any  Product capable of replacing a previously approved  Product in the same operational  environment, with no loss of performance and at no extra cost to the contracting authority,  may be added to the relevant Annexes of the framework contract.  Page 14 of 40  IV.2.5.  Product  developments  IV.2.4.  Co-operation 