Palm Treo 800W User Manual page 306

Encrypting an Expansion Card
When you encrypt an expansion card, the info on the card can be read only by your Treo—so
no one can see what's on the card if it is lost or stolen.
1. Insert the expansion card into the expansion card slot.
2. Press Start
3. Select the System tab, and then select Encryption
4. Check the Encrypt files placed on storage cards box.
Note
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and select Settings.
If your organization enforces an encryption policy, you can see that the box
is checked but you cannot uncheck it.
.
Section 6A: Managing Files and Applications