diff --git a/deny.toml b/deny.toml
new file mode 100644
index 0000000..44db90c
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,36 @@
+# Licence policy for a closed-source commercial product.
+# See docs/LICENSES.md in continuum-common for the rationale and the
+# non-cargo dependencies (external binaries, ML models) this file cannot see.
+#
+# Run: cargo deny check licenses
+
+[licenses]
+# Permissive only. Anything copyleft reaching a shipped binary would make
+# the product undistributable without releasing our source.
+allow = [
+    "MIT",
+    "Apache-2.0",
+    "Apache-2.0 WITH LLVM-exception",
+    "BSD-2-Clause",
+    "BSD-3-Clause",
+    "ISC",
+    "Zlib",
+    "Unicode-3.0",
+    "Unlicense",
+    "MPL-2.0",
+    "CC0-1.0",
+    "BlueOak-1.0.0",
+]
+confidence-threshold = 0.9
+
+# Our own crates declare `LicenseRef-Proprietary`, which is deliberately not
+# an SPDX identifier and must never appear in the allow list above - a
+# third-party crate claiming it would be a real finding. They are recognised
+# as first-party by `publish = false` in their manifests.
+private = { ignore = true }
+
+[bans]
+deny = []
+
+[advisories]
+yanked = "deny"
diff --git a/package.json b/package.json
index b8a4ad3..3b914ba 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,6 @@
 {
   "name": "continuum-schemas",
+  "license": "UNLICENSED",
   "version": "0.1.0",
   "private": true,
   "workspaces": [
diff --git a/packages/rust-types/Cargo.toml b/packages/rust-types/Cargo.toml
index 0bb4ca1..cf5e940 100644
--- a/packages/rust-types/Cargo.toml
+++ b/packages/rust-types/Cargo.toml
@@ -2,6 +2,10 @@
 name = "continuum-rust-types"
 version = "0.1.0"
 edition = "2021"
+# Proprietary: deliberately not an SPDX id, so cargo-deny treats it as
+# first-party. See docs/LICENSES.md in continuum-common.
+license = "LicenseRef-Proprietary"
+publish = false
 
 [lib]
 name = "continuum_types"
diff --git a/packages/ts-types/package.json b/packages/ts-types/package.json
index 9375436..19ea45a 100644
--- a/packages/ts-types/package.json
+++ b/packages/ts-types/package.json
@@ -1,5 +1,6 @@
 {
   "name": "@continuum/ts-types",
+  "license": "UNLICENSED",
   "version": "0.1.0",
   "private": true,
   "type": "module",