Quote:
Originally Posted by Leighlee
I found out that some of the books downloaded from K4Mac 7.x can be converted while others can't. After dragging and dropping quite a few (about 30) books, I noticed that some are KFX, while others are the dreaded KFX-ZIP.
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Thank you for sharing this! Karma to you on your first post
Quote:
Originally Posted by jhowell
That is somewhat good news. It indicates that the new Kindle for Mac is still using DRM that the DeDRM plugin supports, at least for some books.
With KFX format all books sold or loaned by Amazon contain DRM. However there are two categories. Books that the publisher requested to be sold with DRM are locked to the particular device or app for which they are downloaded. Books that the publisher requested be sold without DRM will still have DRM in KFX, but it will not be locked to any single recipient.
Books locked to the Kindle for Mac app will not be able to have their DRM removed because there is no known way to obtain the unique key associated with each installation of that app. But the less restricted books can be unlocked as long as the DRM algorithm used is supported by the DeDRM plugin, as appears to be the case here.
I have no doubt that Amazon will switch to using newer, unbroken DRM as soon as they learn that people are taking advantage of this loophole.
There is no certain way to determine which category any particular book falls. Many with less restrictive DRM will show "Simultaneous device usage: Unlimited" in the product details of the listing but that isn't always the case.
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I ran a bunch of tests. While not absolutely conclusive, I can report that all the books I tested with "Simultaneous device usage: Unlimited" succeeded whereas those without simultaneous device usage failed.