Permanently Disabling Spotlight in Leopard

Question

I've tried the Tiger method (editing the hostconfig file and also turning it off from mdiutil) but no success.
Since Spotlight doesn't encrypt its indexes, it's somewhat of a security risk for FileVault users.
Anybody figure out how to do this for Leopard?
I'm assuming another method would be to create a startup script that would turn off indexing and securely erase any spotlight databases that might exist.

Answer 1

I created a file named fxg97873.txt, which is unique on my system. I then used Disk Utility to create three disk images containing this file:
* 40 MB read/write
* 40 MB read/write encrypted
* read only (using File > New > Disk Image From Folder)
I then deleted the file and emptied the trash. With none of the images mounted, Spotlight does not find the file:
$ mdfind fxg97873
$
With any of the images mounted, Spotlight finds the file by name, but not by content, because indexing is disabled:
$ mdfind fxg97873
/Volumes/spotlight test/fxg97873.txt
$ mdfind 1199931
$ sudo mdutil -s /Volumes/spotlight\ test
/Volumes/spotlight test:
Status: Indexing Disabled
If I enable indexing, it creates an index and can find the file by content:
$ sudo mdutil -i on /Volumes/spotlight\ test
/Volumes/spotlight test:
Indexing enabled for volume.
$ ls -al /Volumes/spotlight\ test
drw------- 8 willeke willeke 272 Oct 28 11:55 .Spotlight-V100
$ mdfind 1199931
/Volumes/spotlight test/fxg97873.txt
However, I cannot enable indexing for the read-only image:
$ sudo mdutil -i on /Volumes/spotlight\ test\ -\ read\ only
/Volumes/spotlight test - read only:
Could not set indexing status for volume.
I did these tests on 10.4.10, as I don't have a 10.5 system handy, but I think the results would be the same. As for NTFS, I would expect it to behave similarly to the read-only disk image.