diff --git a/packages/core/src/addition.ts b/packages/core/src/addition.ts
index 4bb29e5..270498b 100644
--- a/packages/core/src/addition.ts
+++ b/packages/core/src/addition.ts
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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 { provide } from 'vue'
 
 export function add(...animations: (() => void)[]) {
diff --git a/packages/core/src/animation.ts b/packages/core/src/animation.ts
index 543013e..dc648f5 100644
--- a/packages/core/src/animation.ts
+++ b/packages/core/src/animation.ts
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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 type { WatchSource } from 'vue'
 import { getCurrentInstance, watch } from 'vue'
 import { usePlayer } from './player'
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 9d395af..e835f8a 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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.
+ */
+
 export * from './player'
 export * from './animation'
 export * from './widget'
diff --git a/packages/core/src/motion.ts b/packages/core/src/motion.ts
index faebc75..5ec8d1b 100644
--- a/packages/core/src/motion.ts
+++ b/packages/core/src/motion.ts
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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 type { Ref } from 'vue'
 import { inject } from 'vue'
 
diff --git a/packages/core/src/player.ts b/packages/core/src/player.ts
index 09fe1f6..d091395 100644
--- a/packages/core/src/player.ts
+++ b/packages/core/src/player.ts
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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 type { App, Ref } from 'vue'
 import { inject, ref } from 'vue'
 import { AnimationManager } from './animation'
diff --git a/packages/core/src/symbols.ts b/packages/core/src/symbols.ts
index c0b5261..a61c12b 100644
--- a/packages/core/src/symbols.ts
+++ b/packages/core/src/symbols.ts
@@ -1 +1,17 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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.
+ */
+
 export const ADDITION_ANIMATIONS = Symbol('ADDITION_ANIMATIONS')
diff --git a/packages/core/src/widget.ts b/packages/core/src/widget.ts
index 3a36047..2b854b8 100644
--- a/packages/core/src/widget.ts
+++ b/packages/core/src/widget.ts
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2024 BugDuck Team
+ *
+ * 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 type { InjectionKey, Reactive, Ref, Slots } from 'vue'
 import { getCurrentInstance, onMounted, provide, reactive, ref, useSlots } from 'vue'
 import type { AnimationManager } from './animation'