Granting "all permission" in the policy file causes a signed applet to be treated as unsigned

Reported by a customer via Milton Smith

1- Create a signed Applet and an unsigned Applet
2- Run the Applets on 7u40
3- Test applets to confirm signed runs smoothly, without any warnings, and unsigned with warnings
4- Modify java.policy and set grant to AllPermission
5- Run applets again to confirm the unsigned runs ok, and signed does not run as expected (Trust-Library)

Customer points to the class “sun.plugin2.applet.Plugin2ClassLoader”, method “getTrustedCodeSources” as where the failure might be.

ROUGH TRANSLATION (for attached flowchart)
"Início" - Start
"Obter permissões da aplicação" - get application permissions
"Aplicação tem AllPermission ou 'usePolicy'" - Application has AllPermission or usePolicy
"Sim" / "Não" - Yes/No
"Obter permissões do sandbox" - get sandbox permissions
"Aplicação tem mais permissão que o sandbox?" - Does application requires more permission than sandbox?
"Não confiável" - not trusted