English to French Law/Patents Insurance

No assignment of or ***interest in*** this Policy or in any moneys which may be or become payable thereunder is to be binding on or recognised by the Insurer unless a dated notice of such assignment or interest signed by the Assured, and by the assignor in the case of subsequent assignment, is endorsed on this Policy and the Policy with such endorsement is produced before payment of any claim or return of premium thereunder.

Quel est le sens de "interest in" here? Voici un autre exemple du texte:

This Policy attaches from the time the Assured ***assumes interest in*** the subject matter insured and continues until the date on which the vessel is formally returned by the Assured ...