Except where noted, the Silvius btkey firmware source code is released under
the following license:

====

Copyright (c) 2016, Kent "ethereal" Williams-King
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors
may be used to endorse or promote products derived from this software without
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

====

Portions of this software package are from Microchip, and released under the
following license:

====

Copyright (c) 2015, Microchip Technology Inc. and its subsidiaries
("Microchip") All rights reserved.

This software is developed by Microchip Technology Inc. and its
subsidiaries ("Microchip").

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are 
met:

1.      Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
2.      Redistributions in binary form must reproduce the above 
        copyright notice, this list of conditions and the following 
        disclaimer in the documentation and/or other materials provided 
        with the distribution.
3.      Microchip's name may not be used to endorse or promote products
        derived from this software without specific prior written 
        permission.

THIS SOFTWARE IS PROVIDED BY MICROCHIP "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PURPOSE ARE DISCLAIMED. IN NO EVENT 
SHALL MICROCHIP BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING BUT NOT LIMITED TO
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA OR PROFITS;
OR BUSINESS INTERRUPTION) HOWSOEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

====

Portions of this software package are from Signal 11 Software, and distributed
under the following license:

====


Copyright (C) 2013 Alan Ott <[email protected]>
Copyright (C) 2013 Signal 11 Software

M-Stack is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation, version 3; or the Apache License, version 2.0
as published by the Apache Software Foundation.  If you have purchased a
commercial license for this software from Signal 11 Software, your
commerical license superceeds the information in this header.

M-Stack is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this software.  If not, see <http://www.gnu.org/licenses/>.

You should have received a copy of the Apache License, verion 2.0 along
with this software.  If not, see <http://www.apache.org/licenses/>.