secured m3u8 can't play with Roku but with VLC

Why Roku doesn't support secured m3u8 link? I am able to play this in VLC fine. example... http://*****_*********_hl-lh.akamaihd.net/i/**_****_hls_1@175738/master.m3u8?hdnea=st=1410478550~exp=14105...