help! can't strip DRM from free files

felix23 · 01-18-2009, 11:50 PM

I really, really, really would like to use any and all of the following on my iphone using stanza:

http://lds.org/handheld/newarchive/0...4-81-2,00.html

However, those free files are all encrypted, and I for the life of me (and 3 hours of working with mobidedrm) can't strip the DRM.

Any help? Any ideas?

Patricia · 01-19-2009, 12:06 AM

This thread may just help a little:
https://www.mobileread.com/forums/showthread.php?t=33831

felix23 · 01-19-2009, 12:32 AM

Unfortunately, these files I am interested in do have DRM, unlike those spoken of in the link in your response.

For example, when I open them (without any trouble or passwords) in Mobipocket Reader on my PC, the properties section tells me that they are encrypted.

Similarly, when I try to run mobihuff on them, it also tells me that they are encrypted.

However, when I try to decrypt them with mobidedrm, i get this error message:

Error: no key found. maybe the PID is incorrect

Any ideas?

wallcraft · 01-19-2009, 12:32 AM

The file I tried from LDS did not seem to be encrypted at all, although its properties said "content encryption".

For decoding content encrypted files, see Mobipocket Decoder Tool #176.

felix23 · 01-19-2009, 05:33 PM

Awesome, worked after first try.

This, of course, makes me kick myself for not just asking in the forums for help before spending hours working on it myself. (Though, of course, this violates the first rule of etiquette in regards to asking for help in forums.)

Apparently, the files I was trying to open are encrypted. However, from the lines of code I modified, it appears that the only difference between their encryption and that of files keyed to a PID is that the PID shifts the standard encryption key by some amount. Trying to decrypt using any specific PID was unsuccessful just the same as trying to decrypt a PID-keyed file with the wrong PID.

Again, much thanks for solving this puzzle for me.

cocoricks · 02-28-2009, 12:25 AM

Quote:

Originally Posted by felix23

Awesome, worked after first try.

This, of course, makes me kick myself for not just asking in the forums for help before spending hours working on it myself. (Though, of course, this violates the first rule of etiquette in regards to asking for help in forums.)

Apparently, the files I was trying to open are encrypted. However, from the lines of code I modified, it appears that the only difference between their encryption and that of files keyed to a PID is that the PID shifts the standard encryption key by some amount. Trying to decrypt using any specific PID was unsuccessful just the same as trying to decrypt a PID-keyed file with the wrong PID.

Again, much thanks for solving this puzzle for me.

I'm trying to do the same thing, but without success. I modified the script, but it still requires that I enter a PID for it to run. What do I enter for the PID? Or do I need to do something to change the required inputs?

Thanks!

ChelC · 03-01-2009, 06:02 PM

Hey Felix, I'm trying to get the same info on my Sony. If you happen back this way, maybe you can help me??? I haven't been able to figure it out yet. I e-mailed the church but haven't heard anything. If you still visit the boards, could you let me in on it?

felix23 · 03-06-2009, 01:42 AM

i'll check in later, i just got an email with your posts, but i'm about to head to bed.

but i can work something out.

felix23 · 03-12-2009, 03:05 PM

Sorry for the delay.

<link removed by moderator>

This should work for files that are encrypted w/o a PID. A valid PID must be entered, but the program does nothing with it as I remember. Let me know if there are any problems.

Elsi · 03-12-2009, 04:07 PM

Quote:

Originally Posted by felix23

I really, really, really would like to use any and all of the following on my iphone using stanza:

http://lds.org/handheld/newarchive/0...4-81-2,00.html

However, those free files are all encrypted, and I for the life of me (and 3 hours of working with mobidedrm) can't strip the DRM.

Any help? Any ideas?

What makes you think they are DRM encrypted?

I downloaded one of the books:

... unzipped it:

... and immediately opened the book in Mobipocket Reader

pdurrant · 03-12-2009, 06:08 PM

There's a form of Mobipocket DRM that doesn't require a device with a specific PID, only genuine Mobipocket reader software that knows how to do the decoding.

These files will work on any Mobipocket device, but can't be converted to other formats without removing the PID-less DRM scheme.

Quote:

Originally Posted by Elsi

What makes you think they are DRM encrypted?

I downloaded one of the books:

... unzipped it:

... and immediately opened the book in Mobipocket Reader

Elsi · 03-13-2009, 02:00 AM

Quote:

Originally Posted by pdurrant

There's a form of Mobipocket DRM that doesn't require a device with a specific PID, only genuine Mobipocket reader software that knows how to do the decoding.

These files will work on any Mobipocket device, but can't be converted to other formats without removing the PID-less DRM scheme.

Ah ha! An interesting approach. Is there a similar kind of lock for PDF files that will only open in Adobe software?

kevindorsey · 03-16-2009, 07:40 PM

Another frustrating DRM encounter..

03-12-2009, 03:05 PM	#9
felix23 Junior Member Posts: 5 Karma: 10 Join Date: Jan 2009 Device: many	a script Sorry for the delay. <link removed by moderator> This should work for files that are encrypted w/o a PID. A valid PID must be entered, but the program does nothing with it as I remember. Let me know if there are any problems. Last edited by Elsi; 03-12-2009 at 03:53 PM.

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01-18-2009, 11:50 PM	#1
felix23 Junior Member Posts: 5 Karma: 10 Join Date: Jan 2009 Device: many	help! can't strip DRM from free files I really, really, really would like to use any and all of the following on my iphone using stanza: http://lds.org/handheld/newarchive/0...4-81-2,00.html However, those free files are all encrypted, and I for the life of me (and 3 hours of working with mobidedrm) can't strip the DRM. Any help? Any ideas?

01-19-2009, 12:06 AM	#2
Patricia Reader Posts: 11,504 Karma: 8720163 Join Date: May 2007 Location: South Wales, UK Device: Sony PRS-500, PRS-505, Asus EEEpc 4G	This thread may just help a little: https://www.mobileread.com/forums/showthread.php?t=33831

01-19-2009, 12:32 AM	#3
felix23 Junior Member Posts: 5 Karma: 10 Join Date: Jan 2009 Device: many	Unfortunately, these files I am interested in do have DRM, unlike those spoken of in the link in your response. For example, when I open them (without any trouble or passwords) in Mobipocket Reader on my PC, the properties section tells me that they are encrypted. Similarly, when I try to run mobihuff on them, it also tells me that they are encrypted. However, when I try to decrypt them with mobidedrm, i get this error message: Error: no key found. maybe the PID is incorrect Any ideas?

01-19-2009, 12:32 AM	#4
wallcraft reader Posts: 6,977 Karma: 5183568 Join Date: Mar 2006 Location: Mississippi, USA Device: Kindle 3, Kobo Glo HD	The file I tried from LDS did not seem to be encrypted at all, although its properties said "content encryption". For decoding content encrypted files, see Mobipocket Decoder Tool #176.

01-19-2009, 05:33 PM	#5
felix23 Junior Member Posts: 5 Karma: 10 Join Date: Jan 2009 Device: many	Awesome, worked after first try. This, of course, makes me kick myself for not just asking in the forums for help before spending hours working on it myself. (Though, of course, this violates the first rule of etiquette in regards to asking for help in forums.) Apparently, the files I was trying to open are encrypted. However, from the lines of code I modified, it appears that the only difference between their encryption and that of files keyed to a PID is that the PID shifts the standard encryption key by some amount. Trying to decrypt using any specific PID was unsuccessful just the same as trying to decrypt a PID-keyed file with the wrong PID. Again, much thanks for solving this puzzle for me.

03-01-2009, 06:02 PM	#7
ChelC Enthusiast Posts: 30 Karma: 20 Join Date: Feb 2009 Device: Sony 700	Hey Felix, I'm trying to get the same info on my Sony. If you happen back this way, maybe you can help me??? I haven't been able to figure it out yet. I e-mailed the church but haven't heard anything. If you still visit the boards, could you let me in on it?

03-06-2009, 01:42 AM	#8
felix23 Junior Member Posts: 5 Karma: 10 Join Date: Jan 2009 Device: many	i'll check in later, i just got an email with your posts, but i'm about to head to bed. but i can work something out.

03-16-2009, 07:40 PM	#13
kevindorsey Evangelist Posts: 488 Karma: 258 Join Date: Mar 2009 Device: kindle	Another frustrating DRM encounter..

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