I'm not entirely sure who you're talking about.
But generally speaking, as well as an employment situation, NDAs are also used when companies want to keep sensitive information private.
For example, you might be visiting a company and they have some super secret process or something. They may require you to sign an NDA before they will show you that process.
In an entertainment setting, it may be that the NDA will be there so that people don't take photos or record any conversation that was had. A fan may have been told that they can speak to DW but they need to sign an NDA so that they don't share any photos they may take or repeat anything they spoke about.
However, if a person is a victim of crime (or reasonably believes that they are) then an NDA cannot prevent you talking to the police. For example, if a fan signed an NDA and then was subjected to unwanted physical contact then the NDA would not prevent them from reporting this to the police.
However, unless you actually know this then a young person may be fearful of reporting an offence to the police simply because they don't realise that they can go to the police regardless of having signed an NDA.
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The law on NDAs changed last year and with any NDAs signed since then (so this doesn't apply to older NDAs) a victim of crime can also speak to a regulated professional (eg solicitor, doctor, nurse, social worker, teacher etc) or charity for the purpose of getting help or support. Even if you don't report anything to the police.
The new government guidance on this says:
"For example, you have been asked to sign an NDA by a high-profile acquaintance about an incident where they hit you. You report it to the police, and the individual is charged. You then go to a victim support service to get advice on how you navigate the criminal justice system and to get specialist support to help you mentally cope with the impact of the crime. During your engagement with this support service, you are able to tell them about the criminal conduct for the purpose of obtaining support from that service in relation to the crime, even if your NDA says you can’t."
You can now also talk to certain family members, a parent, child, or partner for the purpose of getting support in relation to any criminal activity even if the NDA says that you can't. But this doesn't cover other people such as a cousin or friends.