Print Model's license when downloading (#1512)

* Print model license while downloading

* Make style

* Add a new license link

* Make style

TTS/utils/manage.py

@@ -4,13 +4,23 @@ import os
 import zipfile
 from pathlib import Path
 from shutil import copyfile, rmtree
-from typing import Tuple
+from typing import Dict, Tuple
 
 import requests
 
 from TTS.config import load_config
 from TTS.utils.generic_utils import get_user_data_dir
 
+LICENSE_URLS = {
+    "cc by-nc-nd 4.0": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
+    "mpl": "https://www.mozilla.org/en-US/MPL/2.0/",
+    "mpl2": "https://www.mozilla.org/en-US/MPL/2.0/",
+    "mit": "https://choosealicense.com/licenses/mit/",
+    "apache2.0": "https://choosealicense.com/licenses/apache-2.0/",
+    "apache2": "https://choosealicense.com/licenses/apache-2.0/",
+    "cc-by-sa 4.0": "https://creativecommons.org/licenses/by-sa/4.0/",
+}
+
 
 class ModelManager(object):
     """Manage TTS models defined in .models.json.
@@ -108,6 +118,22 @@ class ModelManager(object):
                 for dataset in self.models_dict[model_type][lang]:
                     print(f" >: {model_type}/{lang}/{dataset}")
 
+    @staticmethod
+    def print_model_license(model_item: Dict):
+        """Print the license of a model
+
+        Args:
+            model_item (dict): model item in the models.json
+        """
+        if "license" in model_item and model_item["license"].strip() != "":
+            print(f" > Model's license - {model_item['license']}")
+            if model_item["license"].lower() in LICENSE_URLS:
+                print(f" > Check {LICENSE_URLS[model_item['license'].lower()]} for more info.")
+            else:
+                print(" > Check https://opensource.org/licenses for more info.")
+        else:
+            print(" > Model's license - No license information available")
+
     def download_model(self, model_name):
         """Download model files given the full model name.
         Model name is in the format
@@ -135,6 +161,7 @@ class ModelManager(object):
             print(f" > Downloading model to {output_path}")
             # download from github release
             self._download_zip_file(model_item["github_rls_url"], output_path)
+            self.print_model_license(model_item=model_item)
         # find downloaded files
         output_model_path, output_config_path = self._find_files(output_path)
         # update paths in the config.json