What does "encryption keys etc. may be predictable" mean in the server logs

I assume this is not an alarming issue, but thought I would ask...what is the significance of the message?

http://discussions.apple.com/thread.jspa?threadID=1772227&tstart=0

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    CoreStorage logical volume groups (2 found)
    |
    +-- Logical Volume Group XX
    |   =========================================================
    |   Name:         Time Machine
    |   Size:         149521805312 B (149.5 GB)
    |   Free Space:   16777216 B (16.8 MB)
    |   |
    |   +-< Physical Volume XX
    |   |   ----------------------------------------------------
    |   |   Index:    0
    |   |   Disk:     disk1s4
    |   |   Status:   Online
    |   |   Size:     149521805312 B (149.5 GB)
    |   |
    |   +-> Logical Volume Family XX
    |       ----------------------------------------------------------
    |       Encryption Status:       Unlocked
    |       Encryption Type:         AES-XTS
    |       Conversion Status:       Complete
    |       Conversion Direction:    -none-
    |       Has Encrypted Extents:   Yes
    |       Fully Secure:            Yes
    |       Passphrase Required:     Yes
    |       |
    |       +-> Logical Volume XX
    |           ---------------------------------------------------
    |           Disk:               disk4
    |           Status:             Online
    |           Size (Total):       149186256896 B (149.2 GB)
    |           Size (Converted):   -none-
    |           Revertible:         Yes (unlock and decryption required)
    |           LV Name:            Time Machine
    |           Volume Name:        Time Machine
    |           Content Hint:       Apple_HFS
    |
    +-- Logical Volume Group XX
         =========================================================
         Name:         HDD
         Size:         350107865088 B (350.1 GB)
         Free Space:   16777216 B (16.8 MB)
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         |   ----------------------------------------------------
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         |   Size:     350107865088 B (350.1 GB)
         |
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             Encryption Status:       Unlocked
             Encryption Type:         AES-XTS
             Conversion Status:       Converting
             Conversion Direction:    forward
             Has Encrypted Extents:   Yes
             Fully Secure:            No
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                 Size (Converted):   29374808064 B (29.4 GB)
                 Revertible:         Yes (unlock and decryption required)
                 LV Name:            HDD
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