According to the Kobo website:
When do I need to use Adobe Digital Editions?
If you use any of Kobo's free reading apps or a Kobo eReader, you may
never need to use Digital Editions at all. Kobo's reading apps and
eReader can automatically download most books from the Kobo Store, and
update your library with them.
The exceptions are when:
I do disagree with idiotprogrammer's answer because this question does dive into DRM which plays a large part in ebooks.
You could try changing the authorization of your Adobe Digital Editions account, reference: "How do I change the authorization on my laptop" with a re-install.
If that doesn't work you would need to contact ebooks.com. Since you're ...
Your Kindle cannot handle .epub files.
You could convert .epub to .mobi e.g. using Calibre, but this is only possible without DRM. There are also plugins to remove DRM, but using them is probably not legal in most jurisdictions.
The simple, answer is that you export the PDFs to files on your disc and then use the add books function of Calibre to add them (or drag and drop) to get them into Calibre.
Any files that have DRM you will not be able to import and read, but you should continue to use these on ADE. Removing the DRM is probably against the law.
Once you have the files ...
I have a different type of Kobo (Glo HD), and no knowledge of DRM
implementation for ePub, though I would expect that a variety of
distinct DRM techniques can be used on ePub files.
I would however expect that an eBook from O'Reilly does not carry DRM. So your problem should have another cause. Which you apparently confirmed by testing on different devices ...
The simplest method I found was to install Calibre along with the DeDRM plugin: https://github.com/apprenticeharper/DeDRM_tools/tree/master/DeDRM_calibre_plugin.
I don't like that I have to do this just to gain access to public library books on my Kindle but saw no other way to accomplish this.
General steps to install the DeDRM plugin
Download the ...
Let me say that I have no idea what the answer to your question is. So what follows is my best guess based on a hunch.
First, it's ridiculous to think that a DRMed ebook is tied to an email. Instead, it is tied to a user account created for a specific vendor. Every website under the sun allows you to change the email for the account. Even if the sign on ...
Amazon and Apple have their own DRM schemes and you won't be able to create an ereader that opens books from their stores. But most others use Adobe DRM, and you can license Adobe's Reader Mobile SDK to do this. ARMSDK is very expensive (when I was involved with a related project many years ago, it was many thousands of dollars a year for a license), and it ...
ADE is not a library, it is software to allow a person to read ebooks. Here are sources for free ebooks if that's what you want:
Free classics on Amazon. https://www.amazon.com/b?ie=UTF8&node=2245146011
Baen free library, mostly scifi and fantasy. http://www.baen.com/catalog/category/...
It happened to me with an .acsm file, but from a different store (it was Kobo); I managed to resolve this problem by downloading the file again, and Adobe Digital Editions was able to import it.
I don't really know what really happened in the background, maybe some error prevented the creation of a valid .acsm file; I can't guarantee that this will help you, ...
I use ADE for basic testing for years and must say it is not the best tool on the market. The problem is its development is rather hectic and releases are often a bit unstable, full of tiny but annoying bugs. As for fonts, you are right with the default serif/sans-serif fonts. It depends on the rendering engine―try to display the same file from the ePub in ...
The problem is definitely with Adobe. They have this thing called DRM (Digital Rights Management), that's essentially a layer of protection that's supposed to minimize the amount of book piracy. Essentially, when you buy a book with DRM (as opposed to DRM-free), you are not downloading a .PDF or .EPUB file, you are getting a .ACSM, which is Adobe's ...
Have you tried reinstalling Adobe Digital Editions?
Has the version of Adobe Air (needed by Digital Editions) changed? Try reinstalling that as well.
Have you tried transferring with another USB cable?
If none of those options seem to fix the issue, give Calibre a go to manage your ebooks. See if it works with that.