MobileRead Forums - View Single Post - "invalid PID checksum" when using mobidedrm, even though it IS valid.

Surfergirl · 10-09-2008, 07:58 AM

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

10-09-2008, 07:58 AM	#41
Surfergirl Enthusiast Posts: 49 Karma: 299 Join Date: Oct 2007 Location: South Wales, UK Device: PRS-505 (Blue)/PRS-505 (Red)/iPhone 3GS	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.