Fairplay Encryption for HLS m3u8 feeds not supported

[GreenFool]

Summary of the bug: Fairplay Encryption for HLS m3u8 feeds not supported.
How to reproduce:

ffmpeg -i "https://hlstvnz-a.akamaihd.net/963482467001/963482467001_5337729382001_5337696518001.m3u8?pubId=963482467001&videoId=5337696518001" -c copy sensingmurder.mkv
ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple LLVM version 7.0.2 (clang-700.1.81)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-frei0r --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.1.2/include/openjpeg-2.1 --enable-nonfree --enable-vda
  libavutil      55. 34.100 / 55. 34.100
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.100 / 57. 56.100
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100

I have an XML file that I sniffed out using Chrome's Web Developer (Network tab) and found that a "Licence URL" that might help in decrypting the file. Wondering if further development with ffmpeg could include an option/flag to insert such a URL to obtain a decryption licence/key?

A sample of the XML file, pertaining to the protected HLS feed, is below.

{"type":"application/vnd.apple.mpegurl","src":"http://hlstvnz-a.akamaihd.net/963482467001/963482467001_5337729382001_5337696518001.m3u8?pubId=963482467001&videoId=5337696518001","key_systems":{"com.apple.fps.1_0":{"key_request_url":"https://fps.brightcove.com/v1/fairplay_session_playback"}},"asset_id":"5337729382001"}

[Carl Eugen Hoyos]

Please test current FFmpeg git head and provide both the failing command line and the complete, uncut console output to make this a valid ticket,