Mobipocket Decoder Tool - Page 26

Jean · 05-24-2010, 10:41 AM

I'll see if I can find a current version of Mobidedrm and give that a try then.

I'm not sure I'm computer savy enough to use a hex editor but I may give it a try if the Mobidedrm doesn't work. I have a lot of (apparently textread) .prc's.

Thanks for the help.

PeterT · 05-24-2010, 11:27 AM

From all I have read changing the string in the file will NOT make a difference; the decoding will still fail.

Jean · 05-24-2010, 11:27 AM

Mobidedrm 0.16 isn't able to remove the drm either so I'm off to investigate hex editing.

Thanks again to everyone.

PeterT · 05-24-2010, 12:09 PM

Quote:

Originally Posted by Jean

Mobidedrm 0.16 isn't able to remove the drm either so I'm off to investigate hex editing.

Thanks again to everyone.

Rather than editting the file, just change the script. You will find at one point where it compares data from the PRC to decode to BOOKMOBI; change that comparison to compare to TEXtREAD (or what ever the exact case was).

DaleDe · 05-24-2010, 01:00 PM

Quote:

Originally Posted by Jean

Yes - It says TEXtREAd. Does that mean it can't be de-DRM'd? or that I have to use another method?

I also appear to have mobidedrm v 0.05 - do I need to upgrade? It de-DRM's my .azw files just fine.

TEXtREAd does not have DRM but is a different format slightly. It can be read by MobiReader but some other readers and converters may not work with it.

Dale

Jean · 05-27-2010, 05:34 PM

I have been able to remove the DRM from my TEXtREAd .prc files and convert them to DRM free .mobi files using pdbshred (and microsoft word and Calibre).

Now I just need to figure out how to remove DRM from .tpz files and I'll be totally DRM free.

FizzyWater · 05-27-2010, 10:20 PM

There's something out there for the .tpz files, too. I thought it was on the same blogs as the ePub stuff...

leebel · 12-27-2010, 12:25 AM

Quote:

Originally Posted by wallcraft

These are probably "content encoded" MOBI files. These are encrypted, but don't have a PID. They can be read by any official MOBI reader but not by 3rd party readers.

The mobidedrm script is supposed to handle such files, since version 0.10. A good source of up to date info on such tools is Apprentice Alf's Blog.

I purchased a few hundred mobi (.prc) books many years ago and can't get them into Calibre 0.7.35 (that will ecentually get to my new Kogn ebook reader). These files all read fine using Mobipocket reader, are encrypted but have no PID. I've scanned these posts over the past week and can't find anything definitive or that works.

What I have done so far-

I've downloaded and run mobidedrm (0.5) with the PC's PID (god knows what I am supposed to use!) and I get "Invalid encryption: type 1".

I also can't seem to get modedrm (using _plugin.py in zip file) into Calibre: It says "No valid plugin found". I've checked and re-checked the file and it looks ok to me.

Finally, in frustration, I seek expert help!

pdurrant · 12-27-2010, 02:22 AM

Quote:

Originally Posted by leebel

I purchased a few hundred mobi (.prc) books many years ago and can't get them into Calibre 0.7.35 (that will ecentually get to my new Kogn ebook reader). These files all read fine using Mobipocket reader, are encrypted but have no PID. I've scanned these posts over the past week and can't find anything definitive or that works.

What I have done so far-

I've downloaded and run mobidedrm (0.5) with the PC's PID (god knows what I am supposed to use!) and I get "Invalid encryption: type 1".

I also can't seem to get modedrm (using _plugin.py in zip file) into Calibre: It says "No valid plugin found". I've checked and re-checked the file and it looks ok to me.

Finally, in frustration, I seek expert help!

Encryption type 1 is an earlier (pre-2003 at least) form of encryption than is used for current mobipocket and kindle ebooks.

I don't know of any tool that will decrypt them.

Is there any chance of re-downloading them? New downloads might have newer encryption.

KevinH · 12-27-2010, 10:19 AM

Hi,

I think if you look in MobiPerl source archive you can find an older tool called pdbshred that can handle these early books. Grab the Mobiperl source and look for a pdbshred.zip file inside. In it you should find a windows pdbshred.exe file that according to others does work on those books. If you are a Mac OSX user and need pdbshred, pm me.

KevinH

leebel · 12-27-2010, 05:05 PM

Thanks PD and Kevin. Appreciate any help I can get.

I looked at the MobiPerl downloaded source and can't see any reference to pdbshread. Then emailed publisher (Performance Quest) but don't hold out much hope for support for the library of books (~2,000!) I purchased in 2004. At least they still exist, but looks like they have morphed into a mobile device service.

Any clues about not being able to plug mobidedrm into Calibre 0.7.35?

pdurrant · 12-27-2010, 05:50 PM

Quote:

Originally Posted by leebel

Any clues about not being able to plug mobidedrm into Calibre 0.7.35?

I'd suggest de-zipping and re-zipping it. Some services (or browser/service combinations) seem to add an erroneous CR/LF at the end of zip files, which upsets the Calibre unzipper.

I'd also suggest that the latest k4mobidedrm plug-in in from the large toolset is a better idea. (See Apprentice Alf's blog for details.)

wallcraft · 12-27-2010, 06:47 PM

Quote:

Originally Posted by leebel

I've downloaded and run mobidedrm (0.5) with the PC's PID (god knows what I am supposed to use!) and I get "Invalid encryption: type 1".

I suggest trying the stand alone mobidedrm from the tools_2.4 bundle. I'm afraid that pdurrant is correct that this DRM is not supported, but version 0.05(?) is pretty old - so it is worth trying the latest version.

leebel · 12-28-2010, 07:09 PM

Quote:

Originally Posted by wallcraft

I suggest trying the stand alone mobidedrm from the tools_2.4 bundle. I'm afraid that pdurrant is correct that this DRM is not supported, but version 0.05(?) is pretty old - so it is worth trying the latest version.

Thanks Wallcraft and pd. Appreciated. Got 2.4_bundle mobidedrm (1.3) and still got-

MOBI header version = 2, length = 220
Error: cannot decode Mobipocket encryption type 1

Also tried pdbshred and managed-

Invalid offset 1182 (49e) ? octets 5
Decompress failed on block #1 (-1)!

Bummer.

KevinH · 01-05-2011, 09:53 AM

Hi leebel,

FYI, this is now an experimental version of a new mobidedrm program for type 1 encrypted files that may/should work with your books. Please pm me for details.

KevinH

Quote:

Originally Posted by leebel

Thanks Wallcraft and pd. Appreciated. Got 2.4_bundle mobidedrm (1.3) and still got-

MOBI header version = 2, length = 220
Error: cannot decode Mobipocket encryption type 1

Also tried pdbshred and managed-

Invalid offset 1182 (49e) ? octets 5
Decompress failed on block #1 (-1)!

Bummer.

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05-24-2010, 10:41 AM	#376
Jean Zealot Posts: 101 Karma: 1069296 Join Date: Dec 2007 Location: Washington State Device: palm tx / Kindle 1 / ebookwise 1150 / Kindle Fire / Kindle Paperwhite	I'll see if I can find a current version of Mobidedrm and give that a try then. I'm not sure I'm computer savy enough to use a hex editor but I may give it a try if the Mobidedrm doesn't work. I have a lot of (apparently textread) .prc's. Thanks for the help.

05-24-2010, 11:27 AM	#377
PeterT Grand Sorcerer Posts: 12,293 Karma: 74007256 Join Date: Nov 2007 Location: Toronto Device: Nexus 7, Clara, Touch, Tolino EPOS	From all I have read changing the string in the file will NOT make a difference; the decoding will still fail.

05-24-2010, 11:27 AM	#378
Jean Zealot Posts: 101 Karma: 1069296 Join Date: Dec 2007 Location: Washington State Device: palm tx / Kindle 1 / ebookwise 1150 / Kindle Fire / Kindle Paperwhite	Mobidedrm 0.16 isn't able to remove the drm either so I'm off to investigate hex editing. Thanks again to everyone.

05-27-2010, 05:34 PM	#381
Jean Zealot Posts: 101 Karma: 1069296 Join Date: Dec 2007 Location: Washington State Device: palm tx / Kindle 1 / ebookwise 1150 / Kindle Fire / Kindle Paperwhite	I have been able to remove the DRM from my TEXtREAd .prc files and convert them to DRM free .mobi files using pdbshred (and microsoft word and Calibre). Now I just need to figure out how to remove DRM from .tpz files and I'll be totally DRM free.

05-27-2010, 10:20 PM	#382
FizzyWater You kids get off my lawn! Posts: 4,220 Karma: 73492664 Join Date: Aug 2007 Location: Columbus, Ohio Device: Oasis 2 and Libra H2O and half a dozen older models I can't let go of	There's something out there for the .tpz files, too. I thought it was on the same blogs as the ePub stuff...

12-27-2010, 10:19 AM	#385
KevinH Sigil Developer Posts: 7,772 Karma: 5446592 Join Date: Nov 2009 Device: many	Hi, I think if you look in MobiPerl source archive you can find an older tool called pdbshred that can handle these early books. Grab the Mobiperl source and look for a pdbshred.zip file inside. In it you should find a windows pdbshred.exe file that according to others does work on those books. If you are a Mac OSX user and need pdbshred, pm me. KevinH

12-27-2010, 05:05 PM	#386
leebel Junior Member Posts: 9 Karma: 10 Join Date: Dec 2010 Device: Kogan	Thanks PD and Kevin. Appreciate any help I can get. I looked at the MobiPerl downloaded source and can't see any reference to pdbshread. Then emailed publisher (Performance Quest) but don't hold out much hope for support for the library of books (~2,000!) I purchased in 2004. At least they still exist, but looks like they have morphed into a mobile device service. Any clues about not being able to plug mobidedrm into Calibre 0.7.35?

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