Zoom Calls Aren't as Private as You May Think. Here's What You Should Know.
Videos and notes can be used by companies and hosts. Here are some tips to protect yourself.
At Laura Purcell's lake community in Rockaway, N.J., a group of 25 moms craved some connection at the end of a long week of coronavirus restrictions. So the mother of 8-year-old triplets arranged a virtual happy hour using Zoom, the teleconferencing service.
The conversation ranged from which wines people were drinking and which stores were still stocking toilet paper to serious talk about how schools and hospitals were managing the crisis.
"It was amazing" Purcell reports. "There were lots of offers to help each other, offering to shop for each other."
What Purcell and her pals didn't think about were the kind of data-privacy concerns that might come up when people use other online platforms such as Facebook or Google. But just like those other web services, Zoom collects personal information about its users and doesn't provide a lot of detail about how it's used for advertising, marketing, or other business purposes.
What Zoom Knows About You
If you're starting to use Zoom, it makes sense to look at the privacy issues from two perspectives. The first thing to understand is what information Zoom itself can collect, and what it can do with the information. Then there's the information that the meeting host gets and how it can be shared.
Individuals can take some measures to safeguard their privacy by changing the way they use the service. But Consumer Reports' advocates say that Zoom should also improve the platform's privacy practices.
In Zoom's case, that extends to what the company calls customer content, or "the content contained in cloud recordings, and instant messages, files, whiteboards ... shared while using the service."
Could your instant messages and videos be used to target advertising campaigns or develop a facial recognition algorithm, like videos collected by other tech companies? That's probably not what people are expecting when they contact a therapist, hold a business meeting, or have a job interview using Zoom.
We reached out to the company for comment on its privacy practices. It acknowledged receiving our questions in an e-mail but hasn't provided answers yet.
"Zoom should update their terms to ensure that data collected during meetings from any participant or host is explicitly excluded from any advertising or marketing use, and that they don't view and tag video footage to train AI for facial or object recognition," says Justin Brookman, director of privacy and technology policy at Consumer Reports.
What Your Host Knows About You
Zoom video conferences are started by what the company calls a “host.” Unlike other services you may have used, Zoom provides the host with rights that might not be immediately apparent to other participants—or, in some cases, to the hosts themselves.
A Zoom host can be someone you know and trust, like the friend who organized Purcell's get together, as well as your employer, a client, a school official, or a relative stranger from a social gathering.
"Zoom puts a lot of power in the hands of the meeting hosts," says Brookman. The host has more power to record and monitor the call than you might realize if you're just a participant, especially if he or she has a corporate account. There are a few things you should know when you're on a call.
When the video is being recorded, a small red button pops up along with the word "recording" in small type. But Fitzgerald says those indicators are easy for many participants to miss.
If a host records a conference, the video could be passed around the same way any video makes the rounds on social media. For that reason, Consumer Reports is recommending that Zoom require participants to click on a consent button before recording can begin. Zoom already has this feature available, but it’s off by default. (If you’re hosting a videoconference, we suggest you use it.)
"While a person going to a video call is pretty clearly agreeing to go to a video call, it's less clear whether they expect that the call will be recorded and reshared at the host's discretion," Fitzgerald says. "For people using Zoom for telemedicine or to access mental health services, or for sharing any information that they don't want disclosed to others, knowing that a recording is being made and how that recording is being stored is important information."
Even if you trust the person running a meeting not to share the content inappropriately, not all hosts are equally sophisticated when it comes to storing personal information. A recording of the video can be stored locally on the hard drive of a laptop or secured on Zoom's cloud storage with a password that the host creates and could, perhaps, share with others.
Zoom provides hosts with a feature that might seem intrusive to participants if they knew about it. The host can turn on "attention tracking" to monitor whether any participant clicks away from the Zoom window for more than 30 seconds while a screen is being shared. It doesn't make any distinction between an employee who is, say, watching a random YouTube video and one who is updating a document related to the meeting.
"If you're teleworking on a home computer, your boss shouldn't be able to monitor what's on your screen. Zoom should get rid of attention tracking mode, or at the very least make participants aware when it's on,” Brookman says.
CR's experts have some advice for enhancing your privacy while using Zoom. First, keep your camera and mic turned off unless you're actually speaking. If you feel that you need to have the camera turned on, Zoom lets you choose a photo as the background for your video. You can pick one from your hard drive or use one supplied by Zoom.
That can be important because the books on the shelf, posters, or other items in your living space can reveal information that you might not want to share with some of your co-workers or clients. And those images of your bedroom may not disappear when the conference is over; they can be stored for months or even years, and shared with people you've never met.