When i boot my cd to install mac ox a lock logo appers in the screen. help what will i do?

when i boot my cd to install mac ox a lock logo appers in the screen. help what will i do? macbook pro thanks for the help..

Provide the computer's firmware password and press Enter. If you don't know the password and can't turn firmware password protection off, contact Apple.
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Boot to the Recovery HD:
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Erase the hard drive:
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2. After DU loads select your startup volume (usually Macintosh HD) from the
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3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
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4. Quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Install button.
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When i boot my cd to install mac ox a lock logo appers in the screen. help what will i do?

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