[Xperia Z5 Compact General] basthet:
Please, stop posting stuff like, enabling that option will delete DRM keys.

Up to now, there is no evidence for that - or even that SW still is protected via DRM keys in the z5c.

Of course, there is the risk to delete potential DRM keys, but that's it.

But for now (and it is very likely) let's assume DRM keys are there...

The mentioned option removes the write protection to the bootloader and trimming area (TA). As long as you're not writing to the TA - e.g. only switching it on and off - nothing happens to any DRM keys.

That's handy if you plan to access the TA, nothing more. Only Sony knows, which memory space is related to the DRM keys. And as long we're not knowing the exact addresses, no-one can export them. And finally: only opening the bootloader does not imply you can safely extract the DRM keys.

But be careful: That's might be a different story with malware... Worst case, you opened the bootloader, and there is already SW around employing an exploit editing the TA. So e.g., the check sum changes and you have DRM keys not anymore suitable for your device.

Ergo: best keep the option disabled , as long you have no use if it.

I also cannot see any reason why Sony would write SW to delete the DRM keys. As far as I know, the loss of DRM keys for previous devices was related to limited knowledge of the TA structure by some (great) developers. Sony never actively deleted the keys. They simply have not told, how to keep them and actively warn, that in case of continuation (unlocking), function might be lost forever - especially if you use non-Sony SW (like a different recovery etc.).

BTW: Formally, you had to register your device to open the bootloader. However, by only opening it, you did not destroy the DRM keys but during the process of writing to the TA.

Finally, I bet: as long as you only enable \ disable the OEM switch, Sony would have to reimburse you for any loss of functionality - at least in the EU. Sony would face tremendous problem to explain, why they introduce an easy to access option, changing the warranty conditions so drastically. Actually, everybody would be able to sue Sony for providing such SW (by law it is forbidden to provide SW only intended to have negative aspects).

BTW: its a complete different story, when you purposely change the e. g. bootloader, flash a custom rom, etc. Then, Sony is only liable for HW defects not caused by the custom rom. But honestly, you will agree:

a) the threshold is far higher to get a custom rom installed than only switch a button, and

b) Sony should not be hold responsible for any SW provided by others.

So, I conclude:

- Sony just made it simpler for us to open the bootloader, and

- it is a higher risk to keep it open than closed.

=> As long there is no evidence that DRM keys are deleted or non-functional (or vice versa): best keep the bootloader locked as you have no benefits from it.

btw: all services formally requiring the DRM keys (Video and Music unlimited, Camera Quality, etc.) are reported to still work after only switching the option on and off. - I'm sure that will changes as soon you have a defective TA or really change the recovery.

...and - of course - this only holds, if Sony kept protecting their SW via DRM keys...

So relax and wait... time will tell (I meant: developer, using this time...). Its just a couple of days that the z5c is available in some markets.

Just keep in mind: The OEM lock is intended to protect the TA for some reason.

So, best keep it closed as long you do not have any benefits from opening it.

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