COPYING

Copyright (c) 2016-2022 The Zcash developers
Copyright (c) 2009-2022 The Bitcoin Core developers
Copyright (c) 2009-2022 Bitcoin Developers

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.


The MIT software license (https://www.opensource.org/licenses/mit-license.php)
above applies to the code directly included in this source distribution, with
the exception of certain Autoconf macros. Dependencies downloaded as part of
the build process may be covered by other open-source licenses. The MIT-licensed
source code is not considered a derived work of these Autoconf macros or of the
dependencies. For further details see 'contrib/debian/copyright'.


Although almost all of the Zcash code is licensed under "permissive" open source
licenses, there are two dependencies that use "copyleft" open source licenses:
- Users and distributors should note that when built using the default build
  options, zcashd depends on Oracle Berkeley DB 6.2.x, which is licensed under
  the GNU Affero General Public License.
- Downstream code forks should note that zcashd depends on the 'orchard' crate,
  which is licensed under the Bootstrap Open Source License.
  A license exception is provided allowing some derived works that are linked or
  combined with the 'orchard' crate to be copied or distributed under the original
  licenses (in this case documented in 'contrib/debian/copyright'), provided that
  the included portions of the 'orchard' code remain subject to BOSL.
  See https://github.com/zcash/orchard/blob/main/COPYING for details of which
  projects can make use of this exception.


Contributors should understand licensing implications before modifying the
following files in build-aux/m4 (see https://github.com/zcash/zcash/issues/2827):

 * ax_check_compile_flag.m4
 * ax_check_link_flag.m4
 * ax_check_preproc_flag.m4
 * ax_pthread.m4