13.1 Each Authority will retain all Intellectual Property in its Material.
13.2 Each Authority will grant all of the other Authorities a non exclusive, perpetual, non-transferable and royalty free licence to use, modify, amend and develop its Material for the Procurement Milestones and any other purpose resulting from the Procurement Milestones whether or not the Authority granting the licence remains a party to this Agreement or the Procurement Milestones.
13.3 Without prejudice to Clause 13.1 (Intellectual Property), if more than one Authority owns or has a legal or beneficial right or interest in any aspect of the Material for any reason (including that no one Authority can demonstrate that it independently supplied or created the relevant Material without the help of one or more of the other Authorities), each of the Authorities who contributed to the relevant Material will grant to all other Authorities to this Agreement a non-exclusive, perpetual, non-transferable and royalty free licence to use and exploit such Material as if all the other Authorities were the sole owner under the Copyright Design and Patents Act 1988 or any other relevant statute or rule of law.
13.4 For the avoidance of doubt, any entity or person who is at the date of this Agreement a party to this Agreement and who has licensed any Intellectual Property under this Agreement will have a non-exclusive, perpetual right to continue to use the licensed Intellectual Property.
13.5 Each Authority warrants that it has or will have the necessary rights to grant the licences set out in Clauses 13.2 and 13.3 (Intellectual Property) in respect of the Material to be licensed.
13.6 Each Authority shall indemnify the other Authorities against any loss arising out of any dispute or proceedings brought by a third party alleging infringement of its intellectual property rights by use of that Authority's intellectual property for the purpose of the Project.