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> The device is open -- does that extend to the notes and filesystem itself? I'm very interested in the ReMarkable 2, but I want to be able to write scripts to handle stuff like syncing.

Yes, the notes just live on the filesystem. You can fetch them using scp or rsync. They are in a proprietary file format, but they are not encrypted, and I think there are some open source projects on github that let you view them on your desktop.

> Especially if the handwriting recognition stuff they have is something I could hook around.

I think the handwriting stuff lives on their cloud and is proprietary, so I have never tried it.

The notes file format itself, I believe is proprietary, but it's been reverse engineered. The general storage I don't believe is actually folder based, but have a look at the unofficial wiki, it should answer most of your questions.

"reverse engineered" means you can't trust them not to break things at any time

In version 1 the converted text couldn't be saved on the device, it could only be sent by e-mail, and so because the text didn't exist on the filesystem it couldn't be accessed via ssh obviously.