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I've been asked this question several times at my recent events. This information came from: http://windowshelp.microsoft.com/Windows/en-US/Help/86136f63-2f2f-40ad-a0d1-8293f4dbfc951033.mspx
BitLocker recovery information is stored in a child object of a computer object in Active Directory. That is, the computer object is the container for the BitLocker recovery object.
More than one BitLocker recovery object can exist for each computer object, because there can be more than one recovery password associated with a BitLocker-enabled volume.
Each BitLocker recovery object on a BitLocker-enabled volume has a unique name and contains a globally unique identifier (GUID) for the recovery password.
The name of the BitLocker recovery object is limited to 64 characters because of Active Directory constraints. This name incorporates the recovery password GUID as well as date and time information. The form is:
<Object Creation Date and Time><Recovery Password GUID>
The Active Directory common name (cn) for the BitLocker recovery object is ms-FVE-RecoveryInformation and includes attributes such as ms-FVE-RecoveryPassword and ms-FVE-RecoveryGuid.