That's a great question!

While the communication is encrypted using TLS, it's not end-to-end (E2E) encrypted. You can always encrypt your files before uploading them.

The primary purpose of this service is to sell the uploaded file to third parties. However, if the file is encrypted, you'll need to distribute the decryption keys to your clients through a separate channel outside of Fewsats, so they can decrypt the file after purchasing it.

We do have a prototype that utilizes public key cryptography and proxy re-encryption, which allows users to request copies of the files encrypted with a specific key. This way, they can download the file, but there's still the issue of the seller having to share those keys with the end users outside our platform.

If we notice a significant demand for this feature, we'll definitely consider implementing it.