diff --git a/crates/dtacheck/Cargo.toml b/crates/dtacheck/Cargo.toml
index d0a73b1..7eddcf9 100644
--- a/crates/dtacheck/Cargo.toml
+++ b/crates/dtacheck/Cargo.toml
@@ -2,6 +2,7 @@
 name = "dtacheck"
 version = "0.1.0"
 edition = "2021"
+publish = false
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -10,4 +11,3 @@ clap = { version = "4.4.12", features = ["derive"] }
 codespan-reporting = "0.11.1"
 derive_more = "0.99.17"
 logos = "0.13.0"
-
diff --git a/crates/swap_art_bytes/Cargo.toml b/crates/swap_art_bytes/Cargo.toml
index 809f88c..b9e14a7 100644
--- a/crates/swap_art_bytes/Cargo.toml
+++ b/crates/swap_art_bytes/Cargo.toml
@@ -2,6 +2,7 @@
 name = "swap_art_bytes"
 version = "0.1.0"
 edition = "2021"
+publish = false
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/deny.toml b/deny.toml
new file mode 100644
index 0000000..fcd1e2d
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,14 @@
+[licenses]
+unlicensed = "deny"
+copyleft = "warn"
+allow-osi-fsf-free = "osi"
+default = "deny"
+
+[licenses.private]
+ignore = true
+
+[bans]
+multiple-versions = "allow"
+deny = [
+    { name = "cc" }
+]