From what security risks does EFS offer protection, and from what risks does it not offer protection? In your own words, describe what a FEK is and how it's used? Feel free to research EFS at http://technet.microsoft.com/en-us/library/cc962103.aspx. With some detail, how can multiple people be granted access to an EFS-encrypted file?

I ALSO NEED ONE APA REFERENCE INCLUDED. I DO NOT WANT A COPY AND PASTE ANSWER FROM A WEBPAGE EITHER.