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Add new top-level licensing information
Clarify better how source code is split between Apache 2.0 and Timescale License, to now serve as a reference file to which GitHub will point. Also cleanup NOTICE to point to LICENSE files.
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‎LICENSE

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Source code in this repository is variously licensed under the Apache License
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Version 2.0, an Apache compatible license, or the Timescale License.
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All source code should have information at the beginning of its respective file
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which specifies its licensing information.
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* Outside of the "tsl" directory, source code in a given file is licensed
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under the Apache License Version 2.0, unless otherwise noted (e.g., an
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Apache-compatible license).
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* Within the "tsl" folder, source code in a given file is licensed under the
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Timescale License, unless otherwise noted.
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When built, separate shared object files are generated for the Apache-licensed
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source code and the Timescale-licensed source code. The shared object binaries
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that contain `-tsl` in their name are licensed under the Timescale License.

‎LICENSE-APACHE

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of your accepting any such warranty or additional liability.
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END OF TERMS AND CONDITIONS
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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boilerplate notice, with the fields enclosed by brackets "[]"
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replaced with your own identifying information. (Don't include
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the brackets!) The text should be enclosed in the appropriate
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comment syntax for the file format. We also recommend that a
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file or class name and description of purpose be included on the
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same "printed page" as the copyright notice for easier
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identification within third-party archives.
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Copyright [yyyy] [name of copyright owner]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.

‎NOTICE

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TimescaleDB (TM)
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Copyright (c) 2016-2017 440 Labs, Inc. dba Timescale. All Rights Reserved.
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Copyright (c) 2017-2018 Timescale, Inc. All Rights Reserved.
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Copyright (c) 2017-2019 Timescale, Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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Source code in this repository is variously licensed under the Apache License
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Version 2.0, an Apache-compatible license, or the Timescale License. Please see
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LICENSE for more information.
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http://www.apache.org/licenses/LICENSE-2.0
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* For a copy of the Apache License Version 2.0, please see LICENSE-APACHE
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as included in this repository's top-level directory.
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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========================================================================
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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and distribution as defined by Sections 1 through 9 of this document.
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"Licensor" shall mean the copyright owner or entity authorized by
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the copyright owner that is granting the License.
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"Legal Entity" shall mean the union of the acting entity and all
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other entities that control, are controlled by, or are under common
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control with that entity. For the purposes of this definition,
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"control" means (i) the power, direct or indirect, to cause the
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direction or management of such entity, whether by contract or
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otherwise, or (ii) ownership of fifty percent (50%) or more of the
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outstanding shares, or (iii) beneficial ownership of such entity.
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"You" (or "Your") shall mean an individual or Legal Entity
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exercising permissions granted by this License.
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transformation or translation of a Source form, including but
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not limited to compiled object code, generated documentation,
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"Work" shall mean the work of authorship, whether in Source or
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of your accepting any such warranty or additional liability.
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END OF TERMS AND CONDITIONS
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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boilerplate notice, with the fields enclosed by brackets "[]"
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replaced with your own identifying information. (Don't include
203-
the brackets!) The text should be enclosed in the appropriate
204-
comment syntax for the file format. We also recommend that a
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file or class name and description of purpose be included on the
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same "printed page" as the copyright notice for easier
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identification within third-party archives.
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Copyright [yyyy] [name of copyright owner]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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* For a copy of the Timescale License, please see LICENSE-TIMESCALE
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as included in this repository's "tsl" directory.
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* For a copy of all other Apache-compatible licenses and notices,
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please see below.
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========================================================================
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NOTICES
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========================================================================
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Certain files in this code base have been modified and/or copied,
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either partially or wholely, from source code from the PostgreSQL
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database management system, which is licensed under the open-source
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PostgreSQL License with the following copyright information.
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========================================================================
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The PostgreSQL License
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========================================================================
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PostgreSQL Database Management System
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(formerly known as Postgres, then as Postgres95)
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Portions Copyright © 1996-2018, The PostgreSQL Global Development Group
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Portions Copyright © 1994, The Regents of the University of California
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Portions Copyright (c) 1996-2018, The PostgreSQL Global Development Group
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Portions Copyright (c) 1994, The Regents of the University of California
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose, without fee, and without a written

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