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Re:ReMarkable 2.0 – A digital notebook that feels like paper by fancy_pantser on Thursday August 27, 2020 @02:31PM (#24296936)
> Is there a tool that makes it easy to buy Kindle books and strip them of their DRM

Yes, the most common one is Calibre, which is also great for converting formats and bulk operations. There is a "DeDRM Plugin" for it on GitHub that does what you're asking.

> Is the ReMarkable capable of running an open source OS behind the hood?

Yes, and there has been some success with this including Parabola-rM. However, there seems to be no open driver for the radio chipset (so no WiFi!).

Re:ReMarkable 2.0 – A digital notebook that feels like paper by kadoban on Thursday August 27, 2020 @09:44PM (#24300601)
The ReMarkable is already running an open source OS behind the hood. It's a bit complicated, the UI isn't open, but it's just running on linux, you can write and run your own programs.
Re:ReMarkable 2.0 – A digital notebook that feels like paper by dheera on Thursday August 27, 2020 @11:14PM (#24301030)
Is it an ARM Debian-based distro or Android or something else?
Re:ReMarkable 2.0 – A digital notebook that feels like paper by kadoban on Friday August 28, 2020 @12:29AM (#24301366)
It's definitely an ARM linux distro, I'm not entirely sure which one to be honest.
Re:ReMarkable 2.0 – A digital notebook that feels like paper by devnonymous on Friday August 28, 2020 @03:25AM (#24302261)
It is a customised yocto Linux iirc.