Hi,
Thank you for posting your query on Microsoft Community.
This issue is better suited in TechNet forum we have a dedicated team with advanced tools and permission to help you with this issue, so I request you to post the same query in TechNet.
https://social.technet.microsoft.com/Forums/en-US/home?category=WinPreview2014
For reference
Help protect your files using BitLocker Drive Encryption
http://windows.microsoft.com/en-us/windows/protect-files-bitlocker-drive-encryption#1TC=windows-8
If you have any further queries related to Windows feel free to post on Microsoft Community we will be glad to help you.
Thanks.