OK. I shouldn't have let the earlier discussion get my hopes up.
I take it the trick mentioned above about massaging MS .lit files won't work for Secure MS Reader format?
Is there a Zaurus Linux reader for any of the popular secure/encrypted ebook formats (Mobipocket, Adobe, MS Reader...)?
(I note Mobipocket has a Linux version of their reader available for download, but you have to choose from platform-specific package files with nothing explicitly for Zaurus or ARM ('it runs on any platform as long as it's PalmOS').)