Dickon25
It sounds like you're having exactly the same problem that I did (and I almost went bald from tearing my hair out). My book was valid, both my PIDs were valid, the version of python was up-do-date, but nothing I did would get past the infuriating "invalid PID" error.
The solution (supplied from another thread) was to make sure that you have actually *opened up* the purchased book - the act of opening it for reading does something clever to the DRM. Trying to run the script against the downloaded but unopened book failed miserably, but when I ran it against the *opened* version it worked perfectly. The post-opened book was stored somewhere like "My e-books", so if you try this you might have some success.
Keeping my fingers crossed for you! Good luck.
Irene
Last edited by Surfergirl; 10-09-2008 at 08:02 AM.
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