Thanks.
I am having Lineage OS 14.1/Android 7.1.2 on my mobile phone all the media apps requiring DRM support works fine. So it means custom os can have support for DRM as well but will have to look into the Lineage image.
I also checked Emteria system files. Certain DRM related files are present but few seems to be missing (i searched keyword "drm" in mobile phone Lineage OS & compared the same with Emteria files).I tried to copy files from phone (Lineage) to Emteria but didn't work.
I think Widevine Libraries can be extracted from Lineage OS 14.1 or Chrome OS recovery image.
Root & more importantly SafetyNet may also have effect on DRM support. So, I also tried to unroot/installing "Magisk" (systemless root - to hide root from apps) on Emteria through recovery but didn't succeed. Tried with bootbridge (for Sony ELF format as detected while flashing magisk zip) also but no success. Link here https://forum.xda-developers.com/apps/magisk/magisk-liboemcrypto-disabler-drm-t3794393
Since my use case for having pi & the Emteria was to play media content only. I moved to installing LibreElec Kodi because they have recently added support for DRM content.... I configured Amazone Prime Video Add-On there & ...What i saw is for DRM content they are downloading the "Chrome OS recovery image" & are extracting Widevine binaries from there.
However, would love to go back to Emteria.
