This is based on SLSA (Supply-chain Levels for Software Artifacts), brought to you by the same fuckers making Trusted Computing and the TMP (Trusted Platform Module). It's part of the same shitstack to prohibit you from altering your software and to lock you out of your own files, and to send spy reports out over the internet so you can be cut off if you "fail" the Trusted Computing check.
The software can use a TPM's (Trusted Platform Module) Sealing function to encrypt your data such that it's impossible to access your own data if the software is modified. It can then pass control over that data only to software updates that carry a signed security certificate from Broadcom (or any other company using this system).
It is no longer open source, your system no longer works as you can no longer access your Sealed data if you change so much as a single letter of the code. Even recompile unaltered code won't work, unless you magically manage to get your build environment absolutely identical to the company's build environment and get byte-for-byte output. Even that may be impossible with the newer levels of non-deterministic compiler optimizations.
Also, with TMP's Remote Attestation feature can be used to transmit your machine's software configuration over the internet, so that you can be cut off if your system doesn't match Broadcom (or other company's) cryptographically signed certificate.
And then of course there's Network Access Control (NAC) / Trusted Network Connect (TNC). In the long term, the goal is for ISPs to use NAC/TNC to interrogate your computer for Trusted Computing compliance, and deny you any internet access whatsoever if your machine isn't compliant. Software with this sort of "security" certificate would pass inspection, while any attempt to alter the code would be detected as "tampering". You then get "quarantined". What "quarantine" means is that you are denied internet access - with the exception that you do get very restricted access which can only be used to download the approved software to "fix" your computer into Trusted Computing compliance.