Player icons (skip previous/next, fast rewind/forward, play, pause): Material Icons by Google,
Apache License 2.0, https://github.com/google/material-design-icons. Paths used unchanged in res/drawable/ic_player_*.xml.
Tab icons (home, apps, menu book, movie, tv, face, article, widgets): the same source and licence, res/drawable/ic_tab_*.xml.