I'm reminded of the ProASIC3 FPGA backdoor debacle of a few years ago. Basically, that FPGA uses hardware AES to allow the FPGA user to specify a cryptographic key to protect the loaded IP from tampering and reading.

There was an undocumented JTAG command found by security researchers at the University of Cambridge which allowed reading protected areas of the FPGA configuration including the user secret key and thereby foiled the protection provided by the hardware AES crypto.

According to the FPGA manufacturer, they did not insert the backdoor intentionally but instead it was just a part of the JTAG black-box they licensed and included in their design.

Namecoin decentralized DNS:
https://github.com/namecoin/wiki/blob/master/HowToBrowseBitDomainsAdvanced.mediawiki

The Gargoyle router firmware supports Namecoin DNS resolution:
https://www.gargoyle-router.com/phpbb/viewtopic.php?f=3&t=2120

OpenNIC supports Namecoin DNS resolution:
https://www.opennicproject.org/configure-your-dns/how-to-change-dns-servers-in-dd-wrt/

Four: two different dedicated players, an Android tablet, and an Android tv box that all support vorbis.

NetUSB by the company KCodes is proprietary not open source software.