https://www.happyassassin.net/2016/06/16/on-snappy-and-flatpak-business-as-usual-in-the-canonical-propaganda-department/
https://plus.google.com/u/0/+ChristophWickert/posts/XWBCgWCLCux
サーバ側含むsnapコンポーネントはクローズドソースらしい