alt Hacker NewsThat's more of a double-edged sword hack than "using DRM". The theory of DRM is for the system to restrict the content from the user, i.e. the system is adversarial to the user and vice versa.
What Signal is doing is trying to get the system to restrict the content from the rest of the system. Which might work as a transient hack but doesn't actually work to protect the user when the system is adversarial, because Microsoft (the adversary) has the DRM private keys. Even some hypothetical DRM system which is effective in oppressing the user wouldn't prevent Microsoft from purloining the user's data whenever they want because they're the ones who make the DRM.
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> because Microsoft (the adversary) has the DRM private keys
Let's be clear here. That's a fine point in the generic sense, but in the Signal situation there are no private keys and it's not really DRM.
Microsoft cant and will not break that trust, because then Netflix and others will stop serving content to Microsoft products.
This is similar to HTTPS certificate chain of trust. The root signing authority needs to be trusted, but once you break that trust there's no going back. It is a self-regulating system.