text: *creators*or from any third parties and all the necessary*pre-existing rights*have been 
  obtained or licensed. 
  
  To that effect, the contractor must establish a list of all*pre-existing rights*to the*results*of 
  this FWC or parts thereof, including identification of the rights’ owners. If there are no*pre-*
  *existing rights*to the*results*, the contractor must provide a declaration to that effect. The 
  contractor must provide this list or declaration to the contracting authority together with 
  the invoice for payment of the balance at the latest. 
  
  **II.13.5. Evidence of granting of pre-existing rights**
  
  Upon request by the contracting authority, the contractor must, in addition to the list 
  mentioned under Article II.13.4., provide evidence that it has the ownership or the right 
  to use all the listed*pre-existing rights*, except for the rights owned or licensed by the 
  contracting authority. The contracting authority may request this evidence even after the 
  end of this FWC. 
  
  This provision also applies to image rights and sound recordings. 
  
  This evidence may refer, for example, to rights to: parts of other documents, images, 
  graphs, sounds, music, tables, data, software, technical inventions, know-how, IT 
  development tools, routines, subroutines or other programs (‘background technology’), 
  concepts, designs, installations or pieces of art, data, source or background materials or 
  any other parts of external origin. 