FCC 在 2014[1] 的一份對為 5 Ghz 影響 FAA 氣象雷達[2]的射頻規定，要求必須從硬體上限制射頻功率與頻段，造成一些誤解[7]，廠商開始封鎖第三方韌體[3][4][5]，也讓社群展開自救活動[6]。最近 FCC 與 TP-Link 和解[8]，在判決書中敘明並非封鎖第三方韌體[9]，而是要求廠商確實遵照法規做好射頻控管[10]，而非讓使用者只要更改國家設定就可以更改射頻頻段。

目前在 Linux 核心上可以用 Central Regulatory Domain Agent (CRDA)[11] 來做射頻控管，雖然這純粹是軟體解決方案，但是相關的配置需要簽章。預設核心會使用 “worldwide-safe” 的設定，如果要使用系統預設以外的射頻空間，使用者必須手動重新編譯核心並加入自己的金鑰，某種程度避免了使用者輕易的透過管理界面修改設定來濫用頻段。

[1]: https://www.fcc.gov/news-events/blog/2015/10/08/securing-rf-devices-amid-changing-technology “Securing RF Devices Amid Changing Technology | Federal Communications Commission”
[2]: https://ecfsapi.fcc.gov/file/7521096518.pdf “Report & Order in the U-NII”
[3]: http://arstechnica.com/information-technology/2016/03/tp-link-blocks-open-source-router-firmware-to-comply-with-new-fcc-rule/ “TP-Link blocks open source router firmware to comply with new FCC rule”
[4]: https://www.wired.com/2016/03/way-go-fcc-now-manufacturers-locking-routers/ “Way to Go, FCC. Now Manufacturers Are Locking Down Routers | WIRED”
[5]: http://ml.ninux.org/pipermail/battlemesh/2016-February/004379.html “[Battlemesh] Chilling effect – Lockdown (FCC/EU)”
[6]: https://libreplanet.org/wiki/Save_WiFi
[7]: https://www.fcc.gov/news-events/blog/2015/11/12/clearing-air-wi-fi-software-updates “Clearing the Air on Wi-Fi Software Updates | Federal Communications Commission”
[8]: https://www.fcc.gov/document/fcc-settlement-tp-link “FCC Settlement with TP-Link | Federal Communications Commission”
[9]: http://arstechnica.com/information-technology/2016/08/fcc-forces-tp-link-to-support-open-source-firmware-on-routers/ “FCC forces TP-Link to support open source firmware on routers | Ars Technica”
[10]: https://apps.fcc.gov/kdb/GetAttachment.html?id=zXtrctoj6zH7oNEOO6De6g%3D%3D&desc=594280%20D02%2 “Software Security Requirements for U-NII Devices”
[11]: https://wireless.wiki.kernel.org/en/developers/regulatory “en:developers:regulatory [Linux Wireless]”