A common case is an employment contract that has an NDA or non-compete or non-poaching section survive the employment itself. I can't say, "I quit, therefore my employment contract doesn't apply any more, therefore I'm going to push all the company secrets to GitHub and you can't stop me."
To be fair, "Warranty Void if Removed" stickers are common but in many cases have no legal standing both in the US, EU, etc. They're just a common "boilerplate" kinda item.
A common case is an employment contract that has an NDA or non-compete or non-poaching section survive the employment itself. I can't say, "I quit, therefore my employment contract doesn't apply any more, therefore I'm going to push all the company secrets to GitHub and you can't stop me."