Modify a Simulink model after protected it

Hello,

There is something I don't understand about the function Simulink.ModelReference.ProtectedModel.setPasswordForModify.

I protect my model with the following script:

mdlref = 'myModel';
open_system(mdlref);
set_param(bdroot, 'ModelReferenceNumInstancesAllowed', 1);
save_system(mdlref);
Simulink.ModelReference.ProtectedModel.setPasswordForModify(mdlref, 'password');
Simulink.ModelReference.ProtectedModel.setPasswordForSimulation(mdlref, 'password');
[harnessHande, neededVars] = Simulink.ModelReference.protect(mdlref, 'Report', true, 'Modifiable', true, 'Mode', 'Accelerator');

In this way, for me the final user will be able to modify the protected model because the argument Modifiable is set to true during the model protection.

But, after adding my protected model on a top model, I can access on the inside of the model, I am never asking for the password.

Two answers for me today:

1. The modification concerns only some properties of the model because a protected model can be modified in any way,
2. I miss a step in the model protection.

Can you help me please? Thank you in advance.

Best regards.