add attribution for unasync, add copyright notices

Author: rohitsanj

LICENSE

@@ -652,3 +652,36 @@ For the files wingetopt.c wingetopt.h downloaded from https://github.com/alex85k
  */
 
 
+
+LICENSE.unasync
+--------------------------------------------------------------
+For unasync code in setup.py, derived from
+https://github.com/encode/httpcore/blob/ae46dfbd4330eefaa9cd6ab1560dec18a1d0bcb8/scripts/unasync.py
+
+Copyright © 2020, [Encode OSS Ltd](https://www.encode.io/).
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

src/confluent_kafka/schema_registry/__init__.py

@@ -30,13 +30,12 @@
   RuleSet,
   Schema,
   SchemaRegistryClient,
+  SchemaRegistryError,
   AsyncSchemaRegistryClient,
   SchemaReference,
   ServerConfig
 )
 
-from .error import SchemaRegistryError
-
 _MAGIC_BYTE = 0
 
 __all__ = [

src/confluent_kafka/schema_registry/protobuf.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright 2020 Confluent Inc.
+# Copyright 2020-2022 Confluent Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,5 +15,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ._async.protobuf import *
-from ._sync.protobuf import *
+from ._async.protobuf import AsyncProtobufSerializer, AsyncProtobufDeserializer
+from ._sync.protobuf import ProtobufSerializer, ProtobufDeserializer

src/confluent_kafka/schema_registry/schema_registry_client.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 #
-# Copyright 2025 Confluent Inc.
+# Copyright 2020 Confluent Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -31,5 +31,7 @@
   ServerConfig
 )
 
+from .error import SchemaRegistryError
+
 from ._async.schema_registry_client import AsyncSchemaRegistryClient
 from ._sync.schema_registry_client import SchemaRegistryClient

tests/common/_async/consumer.py

@@ -1,3 +1,21 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2025 Confluent Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 import asyncio
 
 from confluent_kafka.cimpl import Consumer

tests/common/_async/producer.py

@@ -1,3 +1,21 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2025 Confluent Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
 from confluent_kafka.cimpl import Producer
 import inspect
 import asyncio