diff --git a/README.md b/README.md
index ffe7ab4..5ad3b9c 100644
--- a/README.md
+++ b/README.md
@@ -296,6 +296,23 @@ File bugs and feature requests at [GitHub Issues](https://github.com/StrangeDays
 
 We welcome patches! Please read [CONTRIBUTING.md](CONTRIBUTING.md) before submitting a PR. All contributors must sign the **Contributor License Agreement (CLA)** — the CLA bot will guide you on your first pull request.
 
+## Built with AI · Powered by StrayMark
+
+`arborist-cli` is an experiment in **disciplined AI-assisted development**.
+The implementation — the `clap`-derived CLI surface, the three output
+formats (table / JSON / CSV), the directory traversal layer, self-update
+from GitHub Releases, and the 29-test integration suite — was authored
+largely by AI agents under human direction.
+
+To make that velocity sustainable, we use **[StrayMark](https://straymark.dev)**:
+a CLI for *cognitive discipline in AI-assisted engineering*. It turned every
+architectural choice into an AIDEC record and every implementation block into
+an AILOG — all under `.straymark/`, append-only and audit-ready. The
+governance artifacts emerged **alongside** the code, not as homework after.
+
+> StrayMark is built by Strange Days Tech — the same team behind `arborist-cli`.
+> It is the tool we made to solve our own problem.
+
 ## License
 
 Licensed under either of
@@ -306,3 +323,13 @@ Licensed under either of
 at your option.
 
 Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
+
+---
+
+## Copyright
+
+**`arborist-cli`** is © 2026 **[Strange Days Tech S.A.S. de C.V.](https://strangedays.tech/)** — original author and intellectual-property holder of the source code.
+
+The CLI is released under the dual MIT / Apache-2.0 license above; this notice records authorship and does **not** modify those license terms. Each source file carries an SPDX header reflecting the same.
+
+> Built by **[Strange Days Tech](https://strangedays.tech/)** — México.
diff --git a/src/about.rs b/src/about.rs
index 4fe0f69..8b1f9ec 100644
--- a/src/about.rs
+++ b/src/about.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 pub fn print() {
     let version = env!("CARGO_PKG_VERSION");
     let description = env!("CARGO_PKG_DESCRIPTION");
diff --git a/src/analysis.rs b/src/analysis.rs
index 2cb98f3..a3a3c2a 100644
--- a/src/analysis.rs
+++ b/src/analysis.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io::Read;
 use std::path::{Path, PathBuf};
 
diff --git a/src/cli.rs b/src/cli.rs
index c85b14e..6cbbaaa 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::path::PathBuf;
 
 use clap::{Parser, Subcommand, ValueEnum};
diff --git a/src/error.rs b/src/error.rs
index e35340b..eff5998 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::process::ExitCode;
 
 #[derive(Debug, thiserror::Error)]
diff --git a/src/lib.rs b/src/lib.rs
index b7f9f31..43196d7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 pub mod about;
 pub mod analysis;
 pub mod cli;
diff --git a/src/main.rs b/src/main.rs
index 532396a..a76e925 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::process::ExitCode;
 
 use clap::Parser;
diff --git a/src/output/csv_output.rs b/src/output/csv_output.rs
index 4be77d1..99dcba7 100644
--- a/src/output/csv_output.rs
+++ b/src/output/csv_output.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io;
 
 use arborist::FileReport;
diff --git a/src/output/json.rs b/src/output/json.rs
index ebed1ab..a6df411 100644
--- a/src/output/json.rs
+++ b/src/output/json.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io::{self, Write};
 
 use arborist::FileReport;
diff --git a/src/output/mod.rs b/src/output/mod.rs
index bf7b669..47f59eb 100644
--- a/src/output/mod.rs
+++ b/src/output/mod.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 pub mod csv_output;
 pub mod json;
 pub mod table;
diff --git a/src/output/table.rs b/src/output/table.rs
index 7c75960..09ca5ce 100644
--- a/src/output/table.rs
+++ b/src/output/table.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io::{self, IsTerminal, Write};
 
 use arborist::FileReport;
diff --git a/src/traversal.rs b/src/traversal.rs
index 39da9cc..63e623e 100644
--- a/src/traversal.rs
+++ b/src/traversal.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::path::{Path, PathBuf};
 
 use ignore::WalkBuilder;
diff --git a/src/update.rs b/src/update.rs
index 099a9c4..82a138a 100644
--- a/src/update.rs
+++ b/src/update.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::process::ExitCode;
 
 const CURRENT_VERSION: &str = env!("CARGO_PKG_VERSION");
diff --git a/tests/cli/directory.rs b/tests/cli/directory.rs
index d928508..ba94a12 100644
--- a/tests/cli/directory.rs
+++ b/tests/cli/directory.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 use predicates::prelude::*;
 
diff --git a/tests/cli/exit_codes.rs b/tests/cli/exit_codes.rs
index 2c4d60e..c5bdf43 100644
--- a/tests/cli/exit_codes.rs
+++ b/tests/cli/exit_codes.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 
 fn cmd() -> Command {
diff --git a/tests/cli/filtering.rs b/tests/cli/filtering.rs
index 642ff0c..ea5c278 100644
--- a/tests/cli/filtering.rs
+++ b/tests/cli/filtering.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 use predicates::prelude::*;
 
diff --git a/tests/cli/main.rs b/tests/cli/main.rs
index 2d15060..7839ebb 100644
--- a/tests/cli/main.rs
+++ b/tests/cli/main.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 mod directory;
 mod exit_codes;
 mod filtering;
diff --git a/tests/cli/multi_input.rs b/tests/cli/multi_input.rs
index 1204b80..1d266b6 100644
--- a/tests/cli/multi_input.rs
+++ b/tests/cli/multi_input.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 use predicates::prelude::*;
 
diff --git a/tests/cli/output_formats.rs b/tests/cli/output_formats.rs
index 3f1d9e3..d35a26a 100644
--- a/tests/cli/output_formats.rs
+++ b/tests/cli/output_formats.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 use predicates::prelude::*;
 
diff --git a/tests/cli/single_file.rs b/tests/cli/single_file.rs
index c093ae6..78606e0 100644
--- a/tests/cli/single_file.rs
+++ b/tests/cli/single_file.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 use predicates::prelude::*;
 
diff --git a/tests/cli/stdin.rs b/tests/cli/stdin.rs
index 0dd9b46..19120eb 100644
--- a/tests/cli/stdin.rs
+++ b/tests/cli/stdin.rs
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use assert_cmd::Command;
 use predicates::prelude::*;