English to Italian Bus/Financial Law: Contract(s) CERTIFICATE OF LIABILITY INSURANCE

Salve!
Sto traducendo un certificato di polizza assicurativa
e ho difficoltà con questa espressione.
Qui il contesto:
THIS CERTIFICATE IS ISSUED AS A MATTER OF INFORMATION ONLY AND CONFERS NO RIGHTS UPON THE CERTIFICATE HOLDER. THIS
CERTIFICATE DOES NOT *AFFIRMATIVELY OR NEGATIVELY AMEND*, EXTEND OR ALTER THE COVERAGE AFFORDED BY THE POLICIES
BELOW. THIS CERTIFICATE OF INSURANCE DOES NOT CONSTITUTE A CONTRACT BETWEEN THE ISSUING INSURER(S), AUTHORIZED
REPRESENTATIVE OR PRODUCER, AND THE CERTIFICATE HOLDER.
Un es.:
http://www.mcsl.org/9ACORD_formblank.pdf

Grazie!
Gianna