🚀 go-pugleaf

See my threads on Windows Mobile 5.0 below - they don't support pocketpc . Their reader (usually) works for pdf files but not ebooks - whose site also says they support Palm devices only.

Statistically ebooks have so many pdf titles and WM 5.0 is so common now that the whole thing is illogical, and ebooks.com blame the publisher.

That "permission expired" is exactly the issue I can't find a resolution to, and with hope triumphing over experience (like a second marriage) I petitioned both Adobe and ebooks.com to provide customer support as the only positive step out of the whole affair.
I tried this from Adobe Support but it's a lot of trouble and it didn't change anything. Anyway for what it's worth:

. In Windows Explorer, turn on the "Show hidden files" option.
Tools > Folder options > View > "Show hidden files"

2. Go to C:\Documents and Settings\your username\Application Data\Adobe\Reader\7.0\ and then delete the Digital Editions directory.

* It's safest to back it up on removable media or another machine first.
    * DO NOT delete the directory My Documents\My Digital Editions, because it contains your eBooks.

3. Delete all PDF's from your Pocket PC device.

4. Check that your Pocket PC time and time-zone are same as the desktop system time and time-zone.

5. Delete "activation" or "activation.dat" from the Pocket PC. (The name depends on whether the file extension is set to display or not.) It can be found at:
My Device/Program Files/Adobe/data/

6. Now manually Activate your desktop and your Pocket PC by visiting the URL that follows and logging in with the same Passport or Adobe ID as you used when you downloaded the books.
 <https://aractivate.adobe.com/eden/EdenUI.asp>

7. Add your ebooks to your bookshelf again

* using the Add File option in the Reader bookshelf or download them again
    * If step 7 doesn't work, redownloading the eBooks.

8. Transfer your ebook and it should now work.

9. Ha ha ha

(Number 9 was added by me!)
I also tried some solutions about disabling the security dialogue but I think that's for pdf files and not ebooks which are drm-protected - quite a different matter. Even if the Reader worked, it would have to be far different and better to the normal Reader and more like it's desktop version which works fine. Failing all else sign up for eReader.com and see how a nice reader works on all their books.