"protector_side.png" is presently a copy of:

moreblocks_circle_stone_bricks.png

The early 2010s "moreblocks" license therefore applies to that image.

Everything else:

Copyright (C) 2013 ShadowNinja
Copyright (C) 2019 MultiCraft Development Team

Licensed under the GNU LGPL version 3.0 or later.
See https://www.gnu.org/licenses/lgpl-3.0.txt