On Aug 1, 2011, at 10:59 PM, terrance wrote:

> So What you mean is TSM server don't has its own encryption instead help by 
> the driver or client side encryption?
> ...

The Administrator's Guide for your given TSM release will describe encryption 
opportunities available from the standpoint of the TSM server.  The server 
developers don't waste time creating functionality which is provided by other 
means, such as tape drives (let the hardware do the work) or the client (where 
data must be secure in network conveyance and disk storage pool residency).  
Certainly, it's possible to encrypt data twice, just as it can be subjected to 
multiple phases of processing performing compression in passing data.

   Richard Sims