However, it's still possible to bypass Activation Lock without Apple ID and password - with a little help of the professional tool. So it becomes much more difficult to remove the Activation Lock without knowing the credentials of the previous owner.
Other than that, if someone tries to reset it, this exceptional security app will ask for the previous owner's login credentials. When someone, except the owner of the device, tries to access the phone, it will show the Activation Lock and require a password to unlock.