@Override public LevelConstraint getCounterSignatureConstraint() { SignatureConstraints mainSignature = policy.getSignatureConstraints(); if (mainSignature != null) { UnsignedAttributesConstraints unsignedAttributeConstraints = mainSignature.getUnsignedAttributes(); if (unsignedAttributeConstraints != null) { return unsignedAttributeConstraints.getCounterSignature(); } } return null; }