Is it valid to claim that a jam contains no preservatives?
From the FDA site: "The term 'chemical preservative' as defined by 2l CFR 101.22(a)(5), 'means any chemical that, when added to food tends to prevent or retard deterioration thereof, but does not include common salt, sugars, vinegars, spices or oils extracted from spices, substances added to food by direct exposure thereof to wood smoke, or chemicals applied for their insecticidal or herbicidal properties'.'

So that seems pretty straightforward. Legally, they don't have to claim sugars or acids as preservatives.