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Microsoft Teams will soon block screen capture during meetings

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Re: Microsoft Teams will soon block screen capture during meetings

#201

Post by Aurornis »

cma wrote: post #155
lolinder wrote: post #137

Earlier quoted context omitted.

It's not pure security theater, there are a few clear gains for those who care about such things: * Naive screencaps are much less traceable to the leaker than a naive photo is. Yes, someone can strip out EXIF data, but we've seen over and over again that they generally don't. And even without EXIF a naive framing on the photo is more likely to expose information about the location or identity of the person who took…

> Yeah, there are threat models that won't be stopped here Like running windows in a VM or using an HDMI capture card. And are they going to break running teams meetings when using moonlight etc. with this? If you are OBS capturing during the meeting does it get blacked out or just breaks your recording?

The easiest one is already mentioned in the article: Someone pulling out their phone and snapping a photo.

People know it’s not perfect. However, raising the bar discourages the spontaneous captures that people might try out of habit.

Re: Microsoft Teams will soon block screen capture during meetings

#202

Post by Aurornis »

tw04 wrote: post #191
miki123211 wrote: post #184

Earlier quoted context omitted.

There are two kinds of people in the world, those who completely misunderstand the value of friction, and those who depend on friction too heavily; GP clearly falls into the former group. This feature provides value because it increases friction. It won't stop really determined and motivated users from leaking, but it'll make leaks, especially accidental leaks / those due to hacks, a lot less common. The same applies…

I work in security. I have had customers request this feature. I have asked them to do an anonymous survey of users to ask what action they would take if they were blocked from taking screenshots and users universally say they’d take a picture of their screen with their phone. I don’t underestimate friction, I just know even my grandma would reach for her camera for a picture of her screen and she doesn’t even know w…

> I have asked them to do an anonymous survey of users to ask what action they would take if they were blocked from taking screenshots and users universally say they’d take a picture of their screen with their phone.

Everyone knows this. You don’t need this survey (which surely was a real thing that actually occurred and not something you just conveniently imagined for this argument, right?) to tell you that.

It’s literally written in the linked article.

We know. There are ways around it. But it’s friction, and friction has value. People know it’s not perfect, but it’s another reminder that people aren’t supposed to be doing it.

Re: Microsoft Teams will soon block screen capture during meetings

#203

Post by Aurornis »

smelendez wrote: post #153
tw04 wrote: post #123

Earlier quoted context omitted.

But it’s literally the dumbest feature ever. There’s absolutely nothing preventing a user from pulling out their phone and taking a picture of any slide they want. Or having a camera recording the whole session out of view of their webcam. It is security theater at its peak.

I’ve been on calls where a presenter explicitly asks that people not screenshot slides shown in the meeting because they’re drafts that will be refined and published or circulated later on. Some companies probably have that as a blanket policy. I’m sure this isn’t universally followed. This feature would help make that less likely to happen accidentally or “accidentally.” It wouldn’t stop deliberate leaks but that’s…

We once had an intern who took screenshots of an internal presentation and posted them on the internet to brag about how cool his internship was.

When we did his exit interview he admitted he just wasn’t thinking. He did it all in a couple minutes while in the meeting. Something like this would have stopped him in the process and made him remember that the content was sensitive.

Don’t underestimate the diversity of the people watching zoom meetings. It’s not all engineers with elaborate screen capture setups prepared for the express purpose of recording meetings.

Re: Microsoft Teams will soon block screen capture during meetings

#204

Post by Aurornis »

hedora wrote: post #93
Aurornis wrote: post #81

Earlier quoted context omitted.

> All these are due to laws and regulations that are there to protect the big companies and don’t take into consideration users This feature is not due to laws and regulations. The user in this case is the presenter who clicks the button to enable screenshot protection on their meeting. This is Microsoft trying to deliver a feature their users want , not laws and regulations making them do something their users don’t…

Some people might want it, but it doesn’t actually work. It’s probably also required by some compliance theater in some places.

> Some people might want it, but it doesn’t actually work

It probably works as well as the company firewall blocking sites or the data exfiltration detection blocking companies from being stolen.

Everyone knows they’re not perfect and can be defeated by a sufficiently motivated attacker, but in practice they stop most casual attempts and discourage others.

Re: Microsoft Teams will soon block screen capture during meetings

#205

Post by tylerhou »

chevman wrote: post #69

Most folks know this is easily defeated typically by viewing the content on another device (eg via casting it, remote desktop, phone mirroring, etc) or viewing it from within a VM, and then using the native screen capture functionality on the viewing device to record/screenshot whatever you need. That being said - guessing they are doing this for their enterprise customers mainly, where alot of those other options ar…

Wouldn’t HDCP prevent viewing content on another device? I assume that is what technology they would use to implement this.

Re: Microsoft Teams will soon block screen capture during meetings

#206

Post by Grazester »

NKosmatos wrote: post #78

LOL Another stupid feature (enforced by regulations/law/policies) that has no real world use, besides making us users angry :-( Like Google collecting all of our location history for their own usage, but not allowing us to see it via web anymore (only on mobiles), or having the android dialer not allowing us to record our own phone conversation (easily circumvented), or movie/music/game publishers not allowing us to…

Don't know why Android doesn't allow you to record the call with the dialer. Google voice on the other hand allows this. Just hit 4 and you call is recorded. It is announced to all parties however.

Re: Microsoft Teams will soon block screen capture during meetings

#208

Post by fuzzylightbulb »

Noumenon72 wrote: post #163
flufluflufluffy wrote: post #104

I get that it’s basically impossible to enforce but who are all these people that screencap stuff from Teams meetings? Why do you need to do that? Can you not get the actual material you’re capping via somebody emailing/sharing the actual file? If not, why? Are you not allowed to access it? Or are you all just taking candids of your coworkers for your own devious purposes?

I rigged up a Mac Shortcut with the Extract Text from Screenshot feature so if I see someone visit a URL or display an error message, I can copy the text from the shared screen instead of asking them to paste it into the chat.

Windows can do this via Text Extractor In PowerToys. Unbelievably useful utility that I use all the time.

Re: Microsoft Teams will soon block screen capture during meetings

#209

Post by andrekandre »

crote wrote: post #192
lolinder wrote: post #156

Earlier quoted context omitted.

You don't need to elaborate on mechanisms for bypassing because you're already imagining a threat actor that is out of scope. This is primarily about blocking accidental leaks by regular employees who were asked to not record but ignored it. This kind of reuse of content happens all the time in companies of any significant size and isn't entirely stopped by simple requests or watermarks. This tool gives companies one…

> This is primarily about blocking accidental leaks by regular employees who were asked to not record but ignored it. I think you're seriously overestimating regular employees. A significant number of people will send you smartphone pictures when you ask for a screenshot - why would they suddenly start looking into on-device screen capture when taking a picture or video of some random presentation?

  > A significant number of people will send you smartphone pictures when you ask for a screenshot
n=1 but this is also my experience at $JOB for a majority of times for me as well

Re: Microsoft Teams will soon block screen capture during meetings

#210

Post by charcircuit »

socalgal2 wrote: post #207

Sounds like only a matter of time until Microsoft adds this to Edge (and Chromium) and thenn any page can prevent you from taking a screenshot

This already exists in browsers. It's why you can't screenshot movies on youtube.com or netflix.com for example.
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