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+<!--
+Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+
+SPDX-License-Identifier: MPL-2.0
+
+This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0.  If a copy of the MPL was not distributed with this
+file, you can obtain one at https://mozilla.org/MPL/2.0/.
+
+See the COPYRIGHT file distributed with this work for additional
+information regarding copyright ownership.
+-->
+## BIND 9 Source Access and Contributor Guidelines
+*May 28, 2020*
+
+### Contents
+
+1. [Access to source code](#access)
+1. [Reporting bugs](#bugs)
+1. [Contributing code](#contrib)
+
+### Introduction
+
+Thank you for using BIND 9!
+
+BIND is open source software that implements the Domain Name System (DNS)
+protocols for the Internet. It is a reference implementation of those
+protocols, but it is also production-grade software, suitable for use in
+high-volume and high-reliability applications.  It is very
+widely used DNS software, providing a robust and stable platform on top of
+which organizations can build distributed computing systems with the
+knowledge that those systems are fully compliant with published DNS
+standards.
+
+BIND is and will always remain free and openly available.  It can be
+used and modified in any way by anyone.
+
+BIND is maintained by [Internet Systems Consortium](https://www.isc.org),
+a public-benefit 501(c)(3) nonprofit, using a "managed open source" approach:
+anyone can see the source, but only ISC employees have commit access.
+In the past, the source could only be seen once ISC had published
+a release; read access to the source repository was restricted just
+as commit access was.  That has changed, as ISC now provides a
+public git repository of the BIND source tree (see below).
+
+At ISC, we're committed to
+building communities that are welcoming and inclusive: environments where people
+are encouraged to share ideas, treat each other with respect, and collaborate
+towards the best solutions. To reinforce our commitment, ISC
+has adopted a slightly modified version of the Django
+[Code of Conduct](https://gitlab.isc.org/isc-projects/bind9/-/blob/main/CODE_OF_CONDUCT.md)
+for the BIND 9 project, as well as for the conduct of our developers throughout
+the industry.
+
+### <a name="access"></a>Access to source code
+
+Public BIND releases are always available from the
+[ISC FTP site](ftp://ftp.isc.org/isc/bind9).
+
+A public-access git repository is also available at
+[https://gitlab.isc.org](https://gitlab.isc.org).  This repository
+contains all public release branches. Upcoming releases can be viewed in
+their current state at any time.  Short-lived development branches
+contain unreviewed work in progress.  Commits which address security
+vulnerablilities are withheld until after public disclosure.
+
+You can browse the source online via
+[https://gitlab.isc.org/isc-projects/bind9](https://gitlab.isc.org/isc-projects/bind9)
+
+To clone the repository, use:
+
+>       $ git clone https://gitlab.isc.org/isc-projects/bind9.git
+
+Release branch names are of the form `bind-9.X`, where X represents the second
+number in the BIND 9 version number.  So, to check out the BIND 9.18
+branch, use:
+
+>       $ git checkout bind-9.18
+
+Whenever a branch is ready for publication, a tag is placed of the
+form `v9.X.Y`.  The 9.18.0 release, for instance, is tagged as `v9.18.0`.
+
+The branch in which the next major release is being developed is called
+`main`.
+
+### <a name="bugs"></a>Reporting bugs
+
+Reports of flaws in the BIND package, including software bugs, errors
+in the documentation, missing files in the tarball, suggested changes
+or requests for new features, etc., can be filed using
+[https://gitlab.isc.org/isc-projects/bind9/issues](https://gitlab.isc.org/isc-projects/bind9/issues).
+
+Due to a large ticket backlog, we are sometimes slow to respond,
+especially if a bug is cosmetic or if a feature request is vague or
+low in priority, but we try at least to acknowledge legitimate
+bug reports within a week.
+
+ISC's GitLab system is publicly readable; however, you must have
+an account to create a new issue. You can either register locally or
+use credentials from an existing account at GitHub, GitLab, Google,
+Twitter, or Facebook.
+
+### Reporting possible security issues
+
+See `SECURITY.md`.
+
+### <a name="contrib"></a>Contributing code
+
+BIND is licensed under the
+[Mozilla Public License 2.0](https://www.mozilla.org/en-US/MPL/2.0/).
+Earlier versions (BIND 9.10 and earlier) were licensed under the
+[ISC License](https://www.isc.org/licenses/)
+
+ISC does not require an explicit copyright assignment for patch
+contributions.  However, by submitting a patch to ISC, you implicitly
+certify that you are the author of the code, that you intend to relinquish
+exclusive copyright, and that you grant permission to publish your work
+under the open source license used for the BIND version(s) to which your
+patch will be applied.
+
+#### <a name="bind"></a>BIND code
+
+Patches for BIND may be submitted directly via merge requests in
+[ISC's GitLab](https://gitlab.isc.org/isc-projects/bind9/) source
+repository for BIND.
+
+Patches can also be submitted as diffs against a specific version of
+BIND -- preferably the current top of the `main` branch.  Diffs may
+be generated using either `git format-patch` or `git diff`.
+
+Those wanting to write code for BIND may be interested in the
+[developer information](doc/dev/dev.md) page, which includes information
+about BIND design and coding practices, including discussion of internal
+APIs and overall system architecture.
+
+Every patch submitted is reviewed by ISC engineers following our
+[code review process](doc/dev/dev.md#reviews) before it is merged.
+
+It may take considerable time to review patch submissions, especially if
+they don't meet ISC style and quality guidelines.  If a patch is a good
+idea, we can and will do additional work to bring it up to par, but if
+we're busy with other work, it may take us a long time to get to it.
+
+To ensure your patch is acted on as promptly as possible, please:
+
+* Try to adhere to the [BIND 9 coding style](doc/dev/style.md).
+* Run `make check` to ensure your change hasn't caused any
+  functional regressions.
+* Document your work, both in the patch itself and in the
+  accompanying email.
+* In patches that make non-trivial functional changes, include system
+  tests if possible; when introducing or substantially altering a
+  library API, include unit tests. See [Testing](doc/dev/dev.md#testing)
+  for more information.
+
+##### Changes to `configure`
+
+If you need to make changes to `configure`, you should not edit it
+directly; instead, edit `configure.in`, then run `autoconf`.  Similarly,
+instead of editing `config.h.in` directly, edit `configure.in` and run
+`autoheader`.
+
+When submitting a patch as a diff, it's fine to omit the `configure`
+diffs to save space.  Just send the `configure.in` diffs and we'll
+generate the new `configure` during the review process.
+
+##### Documentation
+
+All functional changes should be documented. There are three types
+of documentation in the BIND source tree:
+
+* Man pages are kept alongside the source code for the commands
+  they document, in files ending in `.rst`: for example, the
+  `named` man page is `bin/named/named.rst`.
+* The *BIND 9 Administrator Reference Manual* is in the .rst files in
+  `doc/arm/`; the PDF and HTML versions are automatically generated from
+  the `.rst` files.
+* API documentation is in the header file describing the API, in
+  Doxygen-formatted comments.
+
+Patches to improve existing documentation are also very welcome!
+
+##### Tests
+
+BIND is a large and complex project. We rely heavily on continuous
+automated testing and cannot merge new code without adequate test coverage.
+Please see [the "Testing" section of doc/dev/dev.md](doc/dev/dev.md#testing)
+for more information.
+
+#### Thanks
+
+Thank you for your interest in contributing to the ongoing development
+of BIND 9.