Netflix added one today mode which allows you to set a four-digit PIN on your profile. The new feature is supposed to stop kids from accessing adult content, but the real reason is something else: to stop the friends you've given the account your profile to be tampered with.
Netflix friends who share their account with others will know that everyone who has access to their profile can see everything, what content they have seen, what the payment method is, not to mention that they can change their password owner.
Not anymore. You can adjust the PIN settings in “Profiles and parents data control”Of application settings. Set a PIN for your account and keep quiet until someone finds it break :).