code: func SignaturePolicy(policyName string, sigPolicy *cb.SignaturePolicyEnvelope) *StandardConfigPolicy {
  	return &StandardConfigPolicy{
  		key: policyName,
  		value: &cb.Policy{
  			Type:  int32(cb.Policy_SIGNATURE),
  			Value: utils.MarshalOrPanic(sigPolicy),
  		},
  	}
  }
docs: // ImplicitMetaMajorityPolicy defines a policy with key policyName and the given signature policy.