They will slowly increase the number over time if you ask them. You can file a support note that says "have deactivated devices 1 & 2; need to add devices 6 & 7." This is necessary because deactivating a device doesn't actually free up one of your six slots--they have to do that on their end.
Oh, and every few years, they may change the whole DRM system so you *can't* reactivate old books; they did that a while ago with their older DRM that worked with Acrobat 5 & 6 before ADE was released.
Kindle used to sell PDF ebooks, from 2005 to 2007; they stopped, meaning those buyers can't open their ebooks anymore, just before they started with Kindles and their mobi ebooks.
The good news: every main commercial DRM in use today, with the exception of iThings, has been cracked. And what's protecting the iThings is the lack of access to ebooks-and-digital-keys on computers that run real programs; as soon as they allow iBooks outside of the walled garden, that'll be cracked.
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Oh, and every few years, they may change the whole DRM system so you *can't* reactivate old books; they did that a while ago with their older DRM that worked with Acrobat 5 & 6 before ADE was released.
Kindle used to sell PDF ebooks, from 2005 to 2007; they stopped, meaning those buyers can't open their ebooks anymore, just before they started with Kindles and their mobi ebooks.
The good news: every main commercial DRM in use today, with the exception of iThings, has been cracked. And what's protecting the iThings is the lack of access to ebooks-and-digital-keys on computers that run real programs; as soon as they allow iBooks outside of the walled garden, that'll be cracked.