According to Microsoft, Bitlocker is not supported to work with Software RAID configurations. Since DataKeeper is essentially a software RAID 1, Microsoft does not support Bitlocker working with DataKeeper.
Note: EFS (Encrypting File System) and TDE (Transparent Disk Encryption) are compatible with DataKeeper and can be used to encrypt data. In addition, both will also encrypt the data sent over the network by DataKeeper.
The specific article and section can be found here:
https://technet.microsoft.com/en-us/library/ee449438#BKMK_R2disks
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