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E-book security via PDF stamping (a DRM alternative)
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E-junkieNinja
E-Junkie Crew
Posts: 383
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# POSTED ON: September 4, 2009 @ 16:28 GMT -7 MODIFIED ON: September 9, 2009 @ 19:56 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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There are several levels or degrees of editing restriction selectable in Acrobat, so that status message, "You can edit this document", may only refer to whatever limited things the buyer is allowed to do with the document without entering the random authoring password we added to it.
I think the things you were able to do to the file -- such as adding highlights and strikethroughs, perhaps also including adding notes and annotations -- aren't counted as "editing" the file; they may be things any reader is allowed to add onto their copy of any PDF, much like highlighting or writing margin notes in a printed book or paper draft, or they may be permitted by whatever specific editing restriction settings you have in place. "Editing" in a substantial sense would be changing the existing text-copy or layout, adding/removing/resizing images, adding/removing/reordering pages, that sort of thing. Are you able to do any of those things to your stamped copy, and if so, can you actually save changes?
I'll have to ask Development, but it's possible that any security settings in your original file would be replaced by whatever security settings our PDF Stamper can apply, since the stamper is essentially creating a new PDF for each buyer, by opening your original and adding the stamp to it before re-saving the file to issue to the buyer. Of course, if you want to prevent copy-pasting and/or printing from the buyer's stamped copy, that should preferably be done using the &pdf_allow_copy=n&pdf_allow_print=n parameters in the PDF Stamping URL you configure for the product.
# POSTED ON: September 9, 2009 @ 19:55 GMT -7
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AJF
member
Posts: 7
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Thanks.
Basically, the e-junkie parameters allow me to control 2 of the 3 conditions shown in the Adobe "Document Status" window. So I guess I should just upload non-protected files and then use the URL parameters to set the copy/paste and print settings.
I'd prefer to control the third ("edit") and have the full protection, but no copy/paste might be enough.
# POSTED ON: September 9, 2009 @ 20:02 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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We do add a random edit password to every stamped PDF, so without knowing that password, buyers should be unable to edit the document in any meaningful way, although they may be able to ~add~ things to their copy such as notes, highlights and strikethroughs which would only deface the file, rather than facilitating piracy or plagiarism. If you are able to do more than that with your stamped copy, please let us know, as there may be something we could improve in the stamping process to forbid editing even more strictly.
# POSTED ON: September 10, 2009 @ 14:40 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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Okay, it appears that our PDF Stamper does create a PDF for each buyer with security settings that may differ from the original in a predictable way.
Because of the way our stamper works as a PDF authoring program itself and creates a brand-new PDF document for each buyer, it has to re-apply any security settings itself and these apparently cannot be simply duplicated from the original source document on a case-by-case basis. Thus, it applies sensible editing restrictions that prevent actions relevant to piracy/plagiarism or removal of the stamp, while allowing other actions that some PDF sellers may actually ~want~ buyers to be able to perform.
Our PDF stamper does add a random author/edit password, which forbids document creation (adding/deleting/changing the existing content) and document assembly (adding/removing/reordering pages), which are the only editing capabilities relevant to piracy or plagiarism. Restrictions on printing or copy/paste actions can also be added y using the &pdf_allow_copy=n&pdf_allow_print=n parameters in our PDF stamping URL.
However, it also permits superficial editing actions which do not affect the original content, such as filling in form fields, adding comments, and adding a digital signature key. For instance, a buyer might be expected to type some data into some form fields provided in the file, add a digital signature key to prove it was really them who filled in the form, and then submit the completed file somewhere.
Thus, apparently the Adobe document status saying, "You can edit this document" is only referring to a limited range of ~some~ things which are permitted, rather than carte blanche to do anything at all to the document content.
# POSTED ON: September 10, 2009 @ 19:12 GMT -7 MODIFIED ON: September 10, 2009 @ 19:19 GMT -7
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AJF
member
Posts: 7
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Tyson,
Thanks for looking into the details. While not a perfect lock-down, it will work as long as buyers can not change/alter the original content.
I'll be using the PDF stamping when I launch a new publication in a few weeks and will let you know how it goes.
Adam
# POSTED ON: September 10, 2009 @ 19:22 GMT -7
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AJF
member
Posts: 7
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I have another request.
On the "Buyer Information" page, it asks for name, email, etc.
At the bottom of the page is a checkbox that says "Sign-up for product updates and newsletter."
I am *very* concerned that a buyer will assume he is signing up for *my* newsletter and updates, not yours.
I suggest one of two options:
1. Give me the option to omit the checkbox sign up on this page.
OR
2. Change the text to indicate that it is an e-junkie list, such as "Sign-up for product updates and newsletter from e-junkie."
I would be extremely grateful if you could make one of these changes within the next week (before I launch my report).
Thanks much,
Adam
# POSTED ON: September 12, 2009 @ 08:14 GMT -7
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E-junkieNinja
E-Junkie Crew
Posts: 383
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Adam,
I will pass on your suggestion to development, but this is standard for all E-junkie users. Also the newsletter is not our newsletter, it is to signup for notifications about updates or newsletters that you may want to send out to your buyers
# POSTED ON: September 12, 2009 @ 16:38 GMT -7
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AJF
member
Posts: 7
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I recognize that it's "standard," but it will be confusing for anyone like me that already has a separate system (constant contact) for sending notifications.
Just my $0.02, there really needs to be some way to distinguish this sign-up from other approaches. This can't be a difficult edit.
And if it's for my notifications -- where/how do I manage that in my e-junkie account? How do I turn it off if I don't want it to appear?
Adam
# POSTED ON: September 12, 2009 @ 19:14 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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We do not send any newsletters of our own to buyers, so we do not solicit subscriptions for such.
That "Sign-up for product updates and newsletter" checkbox actually determines whether or not we add the buyer to your own Buyer Group list for each product they purchased, which would be your recipient lists if you use our Updates and Newsletters service:
http://www.e-junkie.com/ej/help.updates.htm
If you were using our built-in Aweber integration, that checkbox would also determine whether we submit the buyer's info to your Aweber list.
One of the items on Development's do-to list is an option to disable Updates and Newsletters, which would maintain no Buyer Group lists and thus suppress the opt-in checkbox on the few checkout pages we can control (Free Checkout and direct card-based checkouts using PayPal Pro or Authorize.Net).
# POSTED ON: September 13, 2009 @ 13:13 GMT -7 MODIFIED ON: September 13, 2009 @ 13:28 GMT -7
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AJF
member
Posts: 7
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OK.
Will this option appear if I select the "Buy Now" code instead of "E-Junkie Shopping Cart"?
IOW, is this page tied to the use of PDF stamping? If not, then I can just use the "buy Now" button the newsletter option will not appear, correct?
A
# POSTED ON: September 13, 2009 @ 15:26 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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The type of button you use doesn't make any difference, and the subscription opt-in/-out is not related to PDF stamping in any way. I can at least suggest that PayPal standard checkouts have no provision for an opt-in/-out, so all buyers who use PayPal would automatically be added to your Buyer Group(s) for the product(s) they purchased and would not be shown any potentially-confusing subscription options.
# POSTED ON: September 15, 2009 @ 13:41 GMT -7
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CrisBCT
member
Posts: 2
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E-junkieChefPayloadMediaIs there any possibility that support for zipped PDF files could be added? It seems to me it shouldn't be too tough to unzip, stamp and re-zip the PDF file.....
If more people start using the stamping feature and we find this to be a common request, we'll do this.
Yes, this DRM stamping is a very useful facility. I like it lots. And it would be even more useful if I were able also to use it for a zipped PDF file!
So please add my enthusiastic support for this enhancement.
Thanks a bunch for implementing this great feature!
# POSTED ON: September 16, 2009 @ 13:44 GMT -7
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Fran_C
member
Posts: 6
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"Could you make the updates available as a free download and just send the link to the update page only to your list of registered buyers - surely that would do the trick"
I read the above in one of your answers and I have a question:
Does that mean that I would I be able to include a link in my newsletter or my website post to the free pdf I'm giving away without the
recipient having to go through the eJunkie site to download it?
I haven't used eJunkie for quite a while and I'm having to learn all over again...
although I do realize that your system is super simple!
Thank you for your response,
francivile@yahoo.com
# POSTED ON: September 20, 2009 @ 14:17 GMT -7 MODIFIED ON: September 20, 2009 @ 14:27 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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You could email the URL to a secret page on your site where you would have the free product's Add to Cart button, or you could even just email the URL of the Add to Cart button itself.
I'm not clear what you mean about, "the free pdf I'm giving away without the recipient having to go through the eJunkie site to download it"? If you're using E-junkie to collect names and email addresses and issue each recipient a unique, expirable link, then the recipient of your free download would not need to visit or even see the main www.e-junkie.com Web site, but the Free Checkout page uses an e-junkie.com URL, and the thank-you/download page would have an e-junkie.com URL as well.
If you just want people to download a file for free and don't need to collect names/emails nor issue each person a unique link that expires, then you can just upload the file to your Web site and make a link to it, just like you'd make a link from one page to another, and that wouldn't need to involve E-junkie at all.
# POSTED ON: September 20, 2009 @ 17:42 GMT -7
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Fran_C
member
Posts: 6
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Thankyou Tyson,
This is what I'll do:"You could email the URL to a secret page on your site where you would have the free product's Add to Cart button, or you could even just email the URL of the Add to Cart button itself." I do want to collect email addresses and my problem
is not the recipient seeing the e-junkie.com URL ... anyone should see how efficient your system is... besides I am an affiliate!
I haven't used e-junkie for a while and I need to understand it all again - I am familiar with getting download links myself after paying on Paypal for a product and your system
is super... I was having a problem visualizing adding a button in the article on my website or how to add a link to my newsletter, so I will test it all.
Thanks again,
Fran
# POSTED ON: September 20, 2009 @ 23:36 GMT -7
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jimbob
member
Posts: 5
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Please also add my support for the feature request of being able to add this stamp to a .zip file of PDF files.
We are planning to sell "packages" of eBooks.. so each .zip file will contain two or more PDF files.
It would be fantastic if the stamp is possible to be added to each of the included PDF files.
Thanks.
# POSTED ON: October 3, 2009 @ 18:22 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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Because of the way PDF stamping works by taking advantage of certain aspects of the PDF file spec, it will only ever be able to work with actual .pdf files as-is, and unfortunately will never be able to work with .zip'd PDFs.
You might consider using our multiAdd hack to present buyers with a single Add to Cart button that would actually put two or more separate items (each with their own PDF file) into their cart:
http://www.e-junkie.com/bb/topic/2121
# POSTED ON: October 4, 2009 @ 13:59 GMT -7
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jimbob
member
Posts: 5
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That's unfortunate. Seems like it should be simple to unzip the .zip file, process the PDF files, and then rezip them. How is that technically different then if we just give you a PDF file directly? ie: It's the exact same PDF files.. but zipped. So you just need to add a "unzip to temp folder" step first.
(I am a software developer so I'm curious as to the "certain aspects of the PDF file spec" that you say prevents this from working.)
Regardless, the multiAdd hack will not work for us, since the whole point of having multiple PDF files in a single item is to allow the customer to get a discount on multi-ebook purchase.
For example, if we sell each ebook individually for $10, then we want to be able to offer two of them in a single bundle for $15. If there's a way to do that with the multiAdd hack, please let me know. (ie: Can we pass in a price over-ride as part of the multiAdd array data?)
Other then that... I'm very open to any ideas about how to handle our requirements and still get the watermarking to work. That is a major reason I convinced my customer to start using you..so they're not too happy it won't work on their "ebook bundle" items.
Thanks.
# POSTED ON: October 4, 2009 @ 14:12 GMT -7
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E-junkieGuru
E-Junkie Crew
Posts: 1847
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It's actually the layering/compositing features of the PDF spec that allow us to stamp the files; if the file is not a PDF, then the stamper app won't work. The stamper also has no way to unzip files, and even if it did, that would create a fulfillment-timing problem, since each file has to get stamped on-the-fly for each buyer only after payment is completed, and that already takes longer than we'd prefer just selling single PDFs, and especially for large or complex PDFs.
Additional stalling tactics to cover the extra delay required to unzip and rezip a collection of files (not to mention the additional time to stamp more than just one PDF) would only defer buyers' gratification even further, making for an unsatisfactory buyer experience. Moreover, what if not all the files in the .zip are PDFs? What if they have different authoring passwords? What if, what if... It opens a huge can of worms that reintroduces the very problem we'd introduced stamping to avoid, namely, the unsatisfactory buyer experience of DRM-style approaches.
Have you considered simply recompiling each of your PDF file collections into a single PDF for each bundle?
# POSTED ON: October 5, 2009 @ 19:20 GMT -7 MODIFIED ON: October 5, 2009 @ 19:22 GMT -7
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