docs: normalize license

We will use the same dual license in all Torrust repos for now. We will open a new discussion to reach a community consensus.

COPYRIGHT

@@ -0,0 +1,11 @@
+Copyright 2023 in the Torrust-Tracker project are retained by their contributors. No
+copyright assignment is required to contribute to the Torrust-Tracker project.
+
+Some files include explicit copyright notices and/or license notices.
+
+Except as otherwise noted (below and/or in individual files), Torrust-Tracker is
+licensed under the GNU Affero General Public License, Version 3.0 <LICENSE-AGPL_3_0>. This license applies to all files in the Torrust-Tracker project, except as noted below.
+
+Except as otherwise noted (below and/or in individual files), Torrust-Tracker is licensed under the MIT-0 license <LICENSE-MIT_0> for all commits made after 5 years of merging. This license applies to the version of the files merged into the Torrust-Tracker project at the time of merging, and does not apply to subsequent updates or revisions to those files.
+
+The contributors to the Torrust-Tracker project disclaim all liability for any damages or losses that may arise from the use of the project.

Cargo.toml

@@ -1,12 +1,13 @@
 [package]
 name = "torrust-tracker"
 description = "A feature rich BitTorrent tracker."
-license = "AGPL-3.0"
+license-file.workspace = true
 authors.workspace = true
 edition.workspace = true
 version.workspace = true
 
 [workspace.package]
+license-file = "COPYRIGHT"
 authors = ["Nautilus Cyberneering <[email protected]>, Mick van Dijke <[email protected]>"]
 edition = "2021"
 repository = "https://github.com/torrust/torrust-tracker"

LICENSE-MIT_0

@@ -0,0 +1,14 @@
+MIT No Attribution
+
+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.
+
+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.

README.md

@@ -73,9 +73,7 @@ How can you contribute?
 
 ## License
 
-The project is licensed under the terms of the [GNU AFFERO GENERAL PUBLIC LICENSE](./LICENSE).
-
-There is an ongoing discussion about the license of the project. You can follow the discussion [here](https://github.com/torrust/torrust-tracker/pull/251).
+The project is licensed under a dual license. See [COPYRIGHT](./COPYRIGHT).
 
 ## Acknowledgments
 

packages/configuration/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "torrust-tracker-configuration"
 description = "A library to provide configuration to the Torrust Tracker."
-license = "AGPL-3.0"
+license-file.workspace = true
 version.workspace = true
 authors.workspace = true
 edition.workspace = true

packages/located-error/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "torrust-tracker-located-error"
 description = "A library to provide error decorator with the location and the source of the original error."
-license = "AGPL-3.0"
+license-file.workspace = true
 version.workspace = true
 authors.workspace = true
 edition.workspace = true

packages/primitives/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "torrust-tracker-primitives"
 description = "A library with the primitive types shared by the Torrust tracker packages."
-license = "AGPL-3.0"
+license-file.workspace = true
 version.workspace = true
 authors.workspace = true
 edition.workspace = true

packages/test-helpers/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "torrust-tracker-test-helpers"
 description = "A library providing helpers for testing the Torrust tracker."
-license = "AGPL-3.0"
+license-file.workspace = true
 version.workspace = true
 authors.workspace = true
 edition.workspace = true