Add licenses
diff --git a/pkgs/io/example/example.dart b/pkgs/io/example/example.dart
index 136dde9..8e358fd 100644
--- a/pkgs/io/example/example.dart
+++ b/pkgs/io/example/example.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/example/spawn_process_example.dart b/pkgs/io/example/spawn_process_example.dart
index 50f6de9..b7ba247 100644
--- a/pkgs/io/example/spawn_process_example.dart
+++ b/pkgs/io/example/spawn_process_example.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/ansi.dart b/pkgs/io/lib/ansi.dart
index 3a4231e..a2adbe7 100644
--- a/pkgs/io/lib/ansi.dart
+++ b/pkgs/io/lib/ansi.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/io.dart b/pkgs/io/lib/io.dart
index 39e4450..8ee0843 100644
--- a/pkgs/io/lib/io.dart
+++ b/pkgs/io/lib/io.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/ansi_code.dart b/pkgs/io/lib/src/ansi_code.dart
index c023f53..c9a22c5 100644
--- a/pkgs/io/lib/src/ansi_code.dart
+++ b/pkgs/io/lib/src/ansi_code.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/charcodes.dart b/pkgs/io/lib/src/charcodes.dart
index d6557e8..4acaf0a 100644
--- a/pkgs/io/lib/src/charcodes.dart
+++ b/pkgs/io/lib/src/charcodes.dart
@@ -1,4 +1,4 @@
-// Copyright 2021, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/copy_path.dart b/pkgs/io/lib/src/copy_path.dart
index 7906f3c..3a999b6 100644
--- a/pkgs/io/lib/src/copy_path.dart
+++ b/pkgs/io/lib/src/copy_path.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/exit_code.dart b/pkgs/io/lib/src/exit_code.dart
index e6334af..d405558 100644
--- a/pkgs/io/lib/src/exit_code.dart
+++ b/pkgs/io/lib/src/exit_code.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/permissions.dart b/pkgs/io/lib/src/permissions.dart
index 9170749..c516943 100644
--- a/pkgs/io/lib/src/permissions.dart
+++ b/pkgs/io/lib/src/permissions.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/process_manager.dart b/pkgs/io/lib/src/process_manager.dart
index 504311f..84d22ec 100644
--- a/pkgs/io/lib/src/process_manager.dart
+++ b/pkgs/io/lib/src/process_manager.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/shared_stdin.dart b/pkgs/io/lib/src/shared_stdin.dart
index d6cd5e1..72bb50c 100644
--- a/pkgs/io/lib/src/shared_stdin.dart
+++ b/pkgs/io/lib/src/shared_stdin.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/lib/src/shell_words.dart b/pkgs/io/lib/src/shell_words.dart
index 3a76ce5..5fca6d9 100644
--- a/pkgs/io/lib/src/shell_words.dart
+++ b/pkgs/io/lib/src/shell_words.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/_files/stderr_hello.dart b/pkgs/io/test/_files/stderr_hello.dart
index d29f213..ac7a7d3 100644
--- a/pkgs/io/test/_files/stderr_hello.dart
+++ b/pkgs/io/test/_files/stderr_hello.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/_files/stdin_echo.dart b/pkgs/io/test/_files/stdin_echo.dart
index 96913e4..256e0ee 100644
--- a/pkgs/io/test/_files/stdin_echo.dart
+++ b/pkgs/io/test/_files/stdin_echo.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/_files/stdout_hello.dart b/pkgs/io/test/_files/stdout_hello.dart
index 492a190..af3bf51 100644
--- a/pkgs/io/test/_files/stdout_hello.dart
+++ b/pkgs/io/test/_files/stdout_hello.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/ansi_code_test.dart b/pkgs/io/test/ansi_code_test.dart
index 5b911d4..98ae68b 100644
--- a/pkgs/io/test/ansi_code_test.dart
+++ b/pkgs/io/test/ansi_code_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/copy_path_test.dart b/pkgs/io/test/copy_path_test.dart
index bfbf2da..fd1e9ce 100644
--- a/pkgs/io/test/copy_path_test.dart
+++ b/pkgs/io/test/copy_path_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/permissions_test.dart b/pkgs/io/test/permissions_test.dart
index a313aaf..478e8df 100644
--- a/pkgs/io/test/permissions_test.dart
+++ b/pkgs/io/test/permissions_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/process_manager_test.dart b/pkgs/io/test/process_manager_test.dart
index 7faedbe..9871a77 100644
--- a/pkgs/io/test/process_manager_test.dart
+++ b/pkgs/io/test/process_manager_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/shared_stdin_test.dart b/pkgs/io/test/shared_stdin_test.dart
index d973ecc..71629ec 100644
--- a/pkgs/io/test/shared_stdin_test.dart
+++ b/pkgs/io/test/shared_stdin_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
diff --git a/pkgs/io/test/shell_words_test.dart b/pkgs/io/test/shell_words_test.dart
index d0cd89b..dc4441c 100644
--- a/pkgs/io/test/shell_words_test.dart
+++ b/pkgs/io/test/shell_words_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.