How to prevent the regular password prompts when watching a movie on my MacBook Air?

Question

Hello everyone.
I recently started renting movies from the iTunes store and watched them on my MacBook Air since I don't have an appleTV. (In fact on my TV connected via HDMI cable to the MacBook but I think that doesn't change the cause)
Now every now and then a automatic password prompt kicks in overlaying the movie, so I have to stand up each time and type in the administrator password in the middle of the movie. This happens maybe about every 30-45 mins. Needless to say this is extremely unpleasant when watching a movie. Unfortunately I cannot tell you which programm causes the prompt since I always close all other programms other than iTunes.
Is there a way to temporarily prevent all automatic password prompts?
I hope you can help me,
Greetings jonezdotcom

Answer 1

This is taken from Mac Help.  It should guide you in solving your issue.
Changing the way users log in
You can require users to enter a password to log in to your computer, or you can turn on automatic login, which automatically logs in a specified user each time the computer starts up.
Automatic login is useful if you’re the only person who uses your computer, and the computer is always in a safe and secure place. If you have more than one user account on your computer, or if you’re concerned about the security of information on your computer, you should require users to log in with a password. Automatic login is not available for accounts that are using FileVault encryption.
If you require users to log in, you can change what they see in the login window. You can show a list of users with a picture next to each name and a place to enter the password, or require users to enter both their user name and password.
To change the way users log in:
Choose Apple menu > System Preferences and click Accounts.
Open Accounts preferences
Click the lock icon to unlock it, and then type an administrator name and password.
Click Login Options.
Do one of the following:
To require users to log in whenever the computer starts up, choose Off from the “Automatic login” pop-up menu.
To have the computer automatically log in to a particular account when the computer starts up, choose the account from the “Automatic login” pop-up menu, enter an administrator password, and click OK.
IMPORTANT: Automatic login allows anyone to get immediate access to your computer simply by restarting it. If you turn on automatic login, make sure the computer doesn’t automatically log in to an account with administrator privileges.
Next to the ”Display login window as,” select how you want the login window to appear:
To have users select an account from a list in the login window, select “List of users.”
To require users to type their user account name and password, select “Name and password.”
To show each user’s password hint, select the “Show password hints” checkbox.
If you turn on automatic login for yourself, the computer opens your account when it starts up. If you log out, other users see a login window to log in to their user accounts.
The Login Options pane of Accounts preferences
Use the Login Options pane of Accounts preferences to change the way the login window behaves to be more secure or set up the way users will log in to their accounts
PREFERENCE EXPLANATION
Automatic login
To have the computer automatically log in to an account at startup, choose the account from the pop-up menu. This is less secure than requiring users to log in, since it allows anyone to use the computer just by turning it on.
To require users to select an account and enter a password to log in, choose Off from the pop-up menu.
Automatic login is not available for accounts that are using FileVault encryption.
Display login window as
Select “List of users” to have users choose their accounts from a list in the login window.
Select “Name and password” to require users to type their name and password in the login window.