IV.5.2.2.  The trial period shall begin on the day of the installation of the  Software  by the contractor on  the appropriate  hardware  equipment, or if the contracting authority does not require installation  of the  Software  by the contractor, fifteen (15) calendar days after signature of the Consignment note .  IV.5.2.3.  At the end of the trial period, acceptance of the  Software  shall only result from the signature, by  both Parties, of the  Certificate of Conformity  as stated in Article I.1. of the General Conditions. IV.5.2.4.  At any moment during the trial period, the contracting authority may terminate the testing  licence upon notification by a  Means of communication with immediate effect if the  Software does not perform and conform to its description, its specifications or its  Documentation .  Additional acquisitions of  Software  already tested by the contracting authority shall be accepted  by signature of the  Consignment note .  IV.5.3.1.  The contractor shall guarantee all goods delivered in conformity with Article I.1. of the General  Conditions.  IV.5.3.2.  The contractor warrants that:  (1) the  Software  is in conformity with the  Documentation  supplied;  (2) the  Software is capable of performing the functions described in the aforementioned  Documentation and conform to the specifications described in the framework contract or  specific contract under consideration.  IV.5.3.3.  The contractor does not warrant that the  Software  will enable the contracting authority to achieve  its target aims, productivity levels or time savings.  IV.5.3.4.  Guarantee period  IV.5.4.1.  The contractor hereby grants, and the contracting authority accepts, a non- exclusive licence to  use the  Software , under the conditions set hereunder.  IV.5.4.2.  The contracting authority may acquire "floating licences" for use by external, service-providing  companies working under contract on projects for the contracting authority. At the end of the  project, the contracting authority shall reclaim these licences and may either add them to the  existing licence scheme or reallocate them to another company.  IV.5.4.3.  The contracting authority undertakes not to reproduce the  Software  in part or in whole, except for  the purposes of back-ups and archives, and after taking all the necessary precautions. IV.5.4.4.  The Parties may by framework contract agree that the licence be an exclusive licence for the  contracting authority to use the  Software .  IV.5.4.5.  For the purpose of this Article IV.5.4., the  Software  shall be read as including its  Documentation .  Page 25 of 40  IV.5.4.  Use  IV.5.3.  Guarantee specifications for  Software During the two-year guarantee period stated in Article I.1. of the General Conditions, the  contractor shall provide maintenance at its own and sole expense. 