@chrmhoffmann found a solution!
The the FP2 LineageOS ROMs had missing/incorrect libraries for WideWineCDM. Should be fixed in the next nightly! (probably 2017-11-14)
DANGEROUS - BE CAREFUL
For those who can’t wait: Copy those three files onto your system partition. You need to remount the system partition writable before.
- libWVStreamControlAPI_L3.so => /system/vendor/lib/
- libwvdrm_L3.so => /system/vendor/lib/
- libwvdrmengine.so => /system/vendor/lib/mediadrm/
After copying, issue chmod and chown to each file.
chmod 644 FILENAME
chown root:root FILENAME
Don’t forget to remount the system partition read-only at the end!
Finally stop the Netflix app, delete it’s data and restart it.