A device to deliver a proprietary sound track without wifi or bluetooth

Hi. We are a company looking to deliver a proprietary sound track to our clients. The challenge/opportunity is securing the track, non-downloadable; and delivering it to headphones without a wifi or bluetooth connection. Suggestions are so welcome!

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@ClaireD

If you are a company, do you have an IT department? If yes, have you asked them what they can come up with?

Have you thought about all clients (Computers) being connected by Ethernet?

connect several computers by ethernet - Search (bing.com)

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We are a small company without an IT expert. Our ‘clients’ are end users of a product we’ve developed, a scientifically validated sleep solution. The challenge is eliminating bluetooth and wifi from sleeping environments, and protecting the IPR. Thank you! Lynnclaire