sbgp: Sample to Group box
sgpd: Sample Group Descripton box
They are required for DASH Live support.
Change-Id: I2f3b55843c5148db60c7c3a6891ba825b59934ce
The information is generated by Edwin's copyright.py script with some
minor manual modifications.
Chromium's original copyright notice is not replaced.
Also add LICENSE file taken from
https://sites.google.com/a/google.com/ospo/releasing#TOC-BSD-License
Change-Id: I231f09af96a0a611b1ca81e95cab82e12d7f529b