chore: include zstd license in distributions

Author: Rogdham

.gitignore

@@ -3,4 +3,5 @@ __pycache__/
 /dist
 /build
 /.vscode
-/*.pdb
+/*.pdb
+/LICENSE_zstd

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## Unreleased
+
+- Include the `zstd` library license in package distributions
+
 ## 0.17.0 (May 10, 2025)
 
 - Upgrade zstd source code from v1.5.6 to [v1.5.7](https://github.com/facebook/zstd/releases/tag/v1.5.7)

MANIFEST.in

@@ -3,6 +3,7 @@ include CHANGELOG.md
 include LICENSE
 include README.md
 
+include zstd/LICENSE
 recursive-include zstd/lib *
 recursive-include src *
 recursive-include tests *

setup.py

@@ -22,6 +22,20 @@ def read_stuff():
         m = re.search(r'''__version__\s*=\s*(['"])(.*?)\1''', file_content)
         module_version = m.group(2)
 
+    # Create LICENSE_zstd
+    LICENSE_ZSTD_SRC = os.path.join(ROOT_PATH, 'zstd', 'LICENSE')
+    with open(LICENSE_ZSTD_SRC, 'r', encoding='utf-8') as file:
+        license_zstd = file.read()
+    LICENSE_ZSTD_DST = os.path.join(ROOT_PATH, 'LICENSE_zstd')
+    with open(LICENSE_ZSTD_DST, 'w', encoding='utf-8') as file:
+        file.write(
+            "Depending on how it is build, this package may distribute the zstd library,\n"
+            "partially or in its integrality, in source or binary form.\n\n"
+            "Its license is reproduced below.\n\n"
+            "---\n\n"
+        )
+        file.write(license_zstd)
+
     return long_description, module_version
 
 def get_zstd_files_list():