/system/bin/mediaserver and /system/bin/drmserver dont want these but Android disagrees

I used this link Use Adb to disable Media Server hoping to permanenenly disable the battery hogging media server process . It did not work Mediaserver still runs on my Android 4.4 Jiayu S3 phone as /system/bin/mediaserver and I found another just as pricky process called /system/bin/drmserver which shows up on adb # top . So I mounted the /system in RW mode and removed -x from them both. After that I killed the existing processes for these binaries. The phone just froze . After a force restart it will NOT BOOT until I restored the -x bit again ( restored execute ) . What do these do . How do I ensure they don't run if they are not needed.