[Option] /VerifyS[igned] [Description] 
(Optional). Causes Integration Services to check the digital signature of the package. If the package is not signed or the signature is not valid, the package fails. For more information, see Using Digital Signatures with Packages. Important When configured to check the signature of the package, Integration Services only checks whether the digital signature is present, is valid, and is from a trusted source. Integration Services does not check whether the package has been changed. Note The optional BlockedSignatureStates registry value can specify a setting that is more restrictive than the digital signature option set in Business Intelligence Development Studio or at the dtexec command line. In this situation, the more restrictive registry setting overrides the other settings.