[Cryptography] Music players that don't promote eavesdropping?

[Ángel González]

I'd say that pretty much all linux players have such preferences.
I generally use videolan, which does have the option to access the
track list over the internet, but "Allow metadata network access" is
clearly labeled in the preferences, and it will prompt you about what
to do the first time it would try to use it.

However, no matter what product you decide to use, if you want to
ensure that absolutely no data is leaked, your best bet is to block it
at an higher level (LSM, iptables…) so tha this has no network access
at all.

Regards