Our fight against encryption of the public airwaves continues and things keep getting worse for the public. Broadcasters have informed the FCC that they are planning to encrypt emergency alert messages on the new ATSC 3.0 / NextgenTV standard during a FEMA alert test scheduled for next week.
The test is scheduled for November 17 at 2:20 p.m. Eastern Time and will involve television and radio. It will not trigger a cellphone alert. FEMA will originate the message, which broadcasters will then transmit to their audiences. On television, viewers will see an on-screen message and hear an audio announcement explaining that it is a nationwide test and that no action is required.
For viewers watching an encrypted ATSC 3.0 channel, also marketed as NextGen TV, access to that message will depend on their equipment’s ability to decrypt the broadcast. The message will be carried on the broadcast stream, and broadcasters will embed it within the encrypted transmission.
But as we’ve learned, receiving an ATSC 3.0 signal and having authorization to decrypt its programming are separate requirements. A device can support reception of unencrypted ATSC 3.0 broadcasts while being unable to display a protected channel. And many devices that are authorized to decrypt ATSC 3.0 still need an Internet connection to do so.
SiliconDust, the company behind the HDHomeRun network tuners, raised this issue in a filing with the FCC. The company asked broadcasters to turn off encryption beginning at least seven days before the test so that viewers with ATSC 3.0 receivers could receive the message regardless of whether their equipment supports the industry’s DRM system. The company’s concern extends beyond the test itself to whether viewers would have access to emergency information during an actual disaster.
AWARN, an industry organization involved in advanced emergency alerting, opposed that request. In its response to the FCC, it argued that broadcasters should retain content protection and use the test to confirm that signals are transmitted, received and decoded by equipment designed to work with protected broadcasts. The National Association of Broadcasters also supported leaving encryption enabled. Both groups have argued that relatively few receivers would be affected, and the NAB attributed HDHomeRun’s inability to decrypt protected broadcasts to SiliconDust’s design choices.
SiliconDust disputed that characterization in a follow-up filing. The company said its HDHomeRun device had received NextGen TV certification and met the requirements for receiving unencrypted ATSC 3.0 broadcasts. It also said A3SA, the industry group responsible for the content protection system, had not made an approved, deployable solution available for offline reception of encrypted broadcasts through gateway receivers and installed apps on commonly used devices. And apparently the industry has no intentions to approve such a use case.
I use an HDHomeRun every day. It connects to an antenna and my home network, allowing supported televisions, streaming devices, computers and mobile devices to receive television through an app. That setup lets me use the screens and devices I already own without running an antenna cable to each one.
There is also disagreement about how many people are affected. SiliconDust challenged the industry’s estimates and asked for evidence supporting the claim that only a small number of receivers cannot decrypt these broadcasts. Counting televisions sold with compatible tuners does not establish how many people actually use those tuners to watch ATSC 3.0 channels. It also does not resolve questions about how receivers behave when Internet access is unavailable.
That internet dependency is a concern I want to examine during the test. Some receivers that can decrypt protected over-the-air broadcasts rely on an internet connection to do so. A successful test under normal conditions may leave unanswered what happens during an emergency that disrupts internet service. Equipment that works while connected may behave differently when that connection is lost.
If you are available on November 17 at 2:20 p.m. Eastern, I would like to hear how your equipment handles the test. I am particularly interested in televisions with built-in ATSC 3.0 tuners and whether they can display the alert on an encrypted channel after their internet connection has been disconnected. Devices that have not been used for over-the-air viewing recently, or that are behind on firmware updates, may also help reveal reception or decryption problems that would otherwise go unnoticed.
I have put together a survey at lon.tv/surveyeas where you can share your experience after the test. My plan is to compile those results and provide them to the FCC. Reports from viewers using different televisions and tuners can help show how these systems behave outside the conditions described in certification requirements and industry filings.
I see value in ATSC 3.0 and its potential for emergency alerting. My concern is the additional access requirements created by encryption. The November 17 test offers an opportunity to document whether viewers can receive an emergency message with the equipment they already have, including when internet service is unavailable. Those results will help move this discussion from competing claims toward what people can actually receive in their homes.


















