What would be the best way to secure content on a USB key, without encrypting the whole key?

Hello, I bought a USB key recently and I was wondering if there was a way for me to secure some content on it.

I plan on having my **driver's license and other documents**, in case I have to use another computer or if I don't have internet and need to get those documents.

I thought about **Bitlocking** the whole drive, but that would mean that I wouldn't be able to use it on older computers (work computers use Windows …

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