text: Where*pre-existing materials*are inserted in the*results*, the contracting authority may 
  accept reasonable restrictions impacting on the above list, provided that the said materials 
  are easily identifiable and separable from the rest, that they do not correspond to 
  substantial elements of the*results*, and that, should the need arise, satisfactory 
  replacement solutions exist, at no additional costs to the contracting authority. In such 
  case, the contractor will have to clearly inform the contracting authority before making 
  such choice and the contracting authority has the right to refuse it. 
  
  **II.13.4. Identification of pre-existing rights**
  
  When delivering the*results*, the contractor must warrant that, for any use that the 
  contracting authority may envisage within the limits set in this FWC, the newly created 
  parts and the*pre-existing material*incorporated in the*results*are free of claims from 