Yes, some of the DRM parts that are patented technologies cannot be used on other systems.

You can have access to the camera but some noise reduction magic algorithms which are in the DRM are not supported.
Some stuff is computated in the sensor itself and this is basically turned off for SailfishOS or other systems (like AOSP).
Last time I checked 8 Megapixels are the limit of the main camera. Though this might be raised to 13 or even the full sensors 23 Mpx.
We'll see what the first official image will bring.

When it comes to the audio department the Clear Audio or how Sony calls its equalizer and bass optimization isn't available.

So I expect the camera and maybe the audio not to work as superb as the Sony Android version will perform.
I guess it will basically perform like AOSP is on that device.

I'll plan to do some basic tests in regards to the camera when the official image arrives.