The reason why its failing the DRM check is because Neflix only works using DRM or Silver light, off coarse silver light is proprietary to Microsoft and does not work natively on a linux system. When using Chrome its using DRM thats makes use of Google's WideVine library.
Chrome is available on linux I.E Netflix will work on Ubuntu.
But! there are 2 problems with this, the library is compiled to be used on an intel CPU , not only that the libWideVine.so library is not open source and belongs to Google (Meaning you cant just recompile it on your Pi). So If you had to simply copy the library over to your PI it wont work because it wont understand the instruction set of your Raspberry PI CPU which is an ARM CPU used in many potable computers such as a Raspberry PI, Android Phones ect ect.
But there is another but

Google also has an OS called Chrome OS and they do indeed have a Chrome book running an ARM CPU!
So If you download the image mount it in linux in my case ubuntu and then copy the ARM compiled WideVine Library from the ChromeOS (Chrome book recovery image) to your pi via a memory stick or something. It works!
Something to note though, Google released their source of chrome and called it Chromium not supported by google. So You have to install chromium then place the widevine libraries in the correct folder. Chromium on RPI unfortunatly does not support accelerated graphics which means that Netflix works fine in a window, but at fulscreen HD resolutions it stutters and its not watchable.
If you force the display to 480P and run Neflix full screen its "Almost" acceptable. (This is on a RPI 2 not on an RPI 3 which might have better results)
I'm trying to determine if chrome on RPI has accelerated graphics when using Android for PI,Hence the reason why I asked if The chrome browser can stream video on Android for raspberry Pi.