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Reminds me of something similar I have done before -- paper-store, written in a few lines of bash. It also supports large files that don't fit in one QR code, as it can split files among many QR codes, and supports two PDF outputs: dense and sparse. The idea is that it just a simple and dumb paper-store script, it paper-stores the files as they are, it doesn't encrypt files, leaving it up to the user to encrypt their files before paper-storing them. It could gpg-encrypt files with a user-provided passphrase in one line of bash, but users have different preferences when it comes to how their data is encrypted, the method: gpg with a passphrase, gpg to a key, age, etc., the parameters: cipher, hash, and compression algorithms used, etc., and some might even want to use their hardware keys for encryption, so this gives a lot of freedom to how the user wants to encrypt their files, if they even want them encrypted.
Cool. I also looked at paperback but I really wanted to keep things as simple as possible for my specific use case.
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