diff --git a/tap_core/src/checks/mod.rs b/tap_core/src/checks/mod.rs
index a236cd09..7b4e9303 100644
--- a/tap_core/src/checks/mod.rs
+++ b/tap_core/src/checks/mod.rs
@@ -1,3 +1,6 @@
+// Copyright 2023-, Semiotic AI, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
 use crate::tap_receipt::{Checking, ReceiptError, ReceiptResult, ReceiptWithState};
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
diff --git a/tap_core/src/tap_receipt/received_receipt/received_receipt_unit_test.rs b/tap_core/src/tap_receipt/received_receipt/received_receipt_unit_test.rs
index 786285be..857e0843 100644
--- a/tap_core/src/tap_receipt/received_receipt/received_receipt_unit_test.rs
+++ b/tap_core/src/tap_receipt/received_receipt/received_receipt_unit_test.rs
@@ -1,3 +1,6 @@
+// Copyright 2023-, Semiotic AI, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
 use std::{collections::HashMap, str::FromStr, sync::Arc};
 
 use alloy_primitives::Address;