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Old 05-16-2008, 09:59 PM   #16
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I'm curious how it does this with multiple PIDs. Most asymetric ciphers use a key to convert plain text to cipher text. I'm not sure how this would work with 3 keys. Unless the whole file isn't encrypted and there is just some header. Hmmm...

BOb

You know... *I'm* not sure myself. I mean, I've got four PIDS registered with Mobipocket and Fictionwise and when I buy a Secure Mobipocket ebook and download it, I don't have to download one for each of my devices - one download does it all.

Derek
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Old 05-16-2008, 10:05 PM   #17
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You know... *I'm* not sure myself. I mean, I've got four PIDS registered with Mobipocket and Fictionwise and when I buy a Secure Mobipocket ebook and download it, I don't have to download one for each of my devices - one download does it all.

Derek
I wonder if the file is a compressed package with one copy of the document for each PID. Is the document smaller when you have 1 PID registered with the store as opposed to 4?

BOb
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Old 05-16-2008, 10:19 PM   #18
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I wonder if the file is a compressed package with one copy of the document for each PID. Is the document smaller when you have 1 PID registered with the store as opposed to 4?

BOb

I haven't tested it. Nor am I willing to go through the hassle of deleting PIDs from the registered PID lists to find out. I've had hassles changing/adding them before. Sorry.

Derek
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Old 05-16-2008, 10:48 PM   #19
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Wallcraft, did you downloaded this one? If that's the one you had, did you notice the restrictions on it? The conversion could have failed because of the DRM put on the file by Adobe.

XHTML Rights:
Copying not allowed
Printing not allowed
Lending not allowed
Reading aloud not allowed

P.S. Try one from Feedbooks instead. I'll try some also.
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Old 05-16-2008, 11:12 PM   #20
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If that's the one you had, did you notice the restrictions on it?
That is the one, but I never got to the full web page on the ebook. It does not have DRM, and I don't see these restrictions in the actual .epub. The .opf file says:
Quote:
<dc:rights>Public Domain</dc:rights>
What it does have is an embedded font, which might be part of the problem.

I have tried EPUBs from feedbooks, and they work except that the .ncx file is again ignored. There is a TOC, but it comes from the guide section of the .opf file rather than the .ncx file.
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Old 05-16-2008, 11:18 PM   #21
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That is the one, but I never got to the full web page on the ebook. It does not have DRM, and I don't see these restrictions in the actual .epub. The .opf file says: What it does have is an embedded font, which might be part of the problem.

I have tried EPUBs from feedbooks, and they work except that the .ncx file is again ignored. There is a TOC, but it comes from the guide section of the .opf file rather than the .ncx file.
If there is no DRM, then the conversion should have worked. I tried a couple from Feedbooks, and you're right. It leaves much to be desired.

There is a vast amount of data in the epub file. The conversion should be just as good as a conversion from an exploded MSLIT.
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Old 05-17-2008, 12:21 AM   #22
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Originally Posted by delphidb96 View Post
I haven't tested it. Nor am I willing to go through the hassle of deleting PIDs from the registered PID lists to find out. I've had hassles changing/adding them before. Sorry.
No big deal. Just my geek/programmer curiosity.

BOb
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Old 05-17-2008, 02:38 AM   #23
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I wonder if the file is a compressed package with one copy of the document for each PID. Is the document smaller when you have 1 PID registered with the store as opposed to 4?

BOb
No, it isn't. I've just re-downloaded my (extremely large) Chambers Dictionary having added the PID of my new Gen3. The file is the same size.
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Old 05-17-2008, 12:10 PM   #24
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No, it isn't. I've just re-downloaded my (extremely large) Chambers Dictionary having added the PID of my new Gen3. The file is the same size.
Thanks for the info. The plot thickens.

BOb
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Old 05-17-2008, 05:06 PM   #25
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Thanks for the info. The plot thickens.
Not necessarily. One way to achieve this would be a two-step process where you encrypt each book with a key unique to that book, then encrypt the key needed to decrypt the book with the PID. If the mobipocket format has a fixed place to store the decryption key four times for each of the four PIDs allowed, the size doesn't need to change.

If you assume a 2048 bit key for encrypting/decrypting the book, then storing four encrypted versions of that key takes 1 kB, which isn't that much.

I don't know if this is what happens, but IIRC, this is how gnupg works if you encrypt an email for multiple recipients (except that gnupg doesn't have a fixed number of "slots", so each additional recipient you encrypt the message for enlarges the whole thing by a couple hundred bytes).
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Old 05-17-2008, 05:46 PM   #26
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I have tried EPUBs from feedbooks, and they work except that the .ncx file is again ignored. There is a TOC, but it comes from the guide section of the .opf file rather than the .ncx file.
Which will generate a very ugly TOC then since we follow the advice from Adobe's best practice guide and divide our books into multiple-flows.

I guess that currently, they generate the TOC this way, because that's how OEBPS1.0 worked with an OPF and they didn't changed anything compared to their normal Mobipocket generation.
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Old 05-17-2008, 06:55 PM   #27
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Not necessarily. One way to achieve this would be a two-step process where you encrypt each book with a key unique to that book, then encrypt the key needed to decrypt the book with the PID. If the mobipocket format has a fixed place to store the decryption key four times for each of the four PIDs allowed, the size doesn't need to change.

If you assume a 2048 bit key for encrypting/decrypting the book, then storing four encrypted versions of that key takes 1 kB, which isn't that much.

I don't know if this is what happens, but IIRC, this is how gnupg works if you encrypt an email for multiple recipients (except that gnupg doesn't have a fixed number of "slots", so each additional recipient you encrypt the message for enlarges the whole thing by a couple hundred bytes).
There's a 16-byte primary key (the same across all Secure Mobipocket ebooks) and a 10-byte PID key. That gives 128 bits in the hidden key and 80 bits in the PID key. I suppose you should study how the various decryption python scripts handle it all.

Derek
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Old 05-19-2008, 06:54 PM   #28
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Reading aloud not allowed
*is amused* How would they enforce that one.
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Old 05-20-2008, 03:06 AM   #29
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*is amused* How would they enforce that one.
The Windows version of Microsoft Reader has a "reading aloud" feature (which actually works pretty well). It's disabled for books with DRM.
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Old 05-20-2008, 02:34 PM   #30
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Oh, I didn't know that. But still, you have to admit it sounds awfully funny to not allow something to be read aloud.

Even if the program won't read it aloud, nothing is stopping the person who bought it from doing so. I fail to see how disabling that protects much of anything.
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