Data --> Paper and back for Linux

[Caleb Marcus]

I'm wondering if there's any software available that will take data,
produce an image that can be printed, and allow a scanned version of it
to be converted back to data. There's always base64 and OCR, but I'm
wondering if there's anything that'll get higher usable density. I'm
thinking of making something like this for fun, but it'll be difficult,
and it would be nice to look at previously-done examples of it.
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