When you can no longer download your Kindle eBooks to remove the DRM and convert to ePub because Amazon is taking away D&T and you don't have a compatible Kindle to download eBooks so you can remove the DRM and you don't know how else to do this.
When you have a Kindle registered to your account to allow D&T to work but that Kindle is actually dead and is just there for D&T and you are reading a series (exclusive to Amazon) you won't be able to finish because D&T will be gone.
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