diff --git a/deny.toml b/deny.toml
index 75b6ac9b..e810c910 100644
--- a/deny.toml
+++ b/deny.toml
@@ -1,6 +1,8 @@
 [licenses]
 unlicensed = "deny"
-allow = ["Apache-2.0", "Apache-2.0 WITH LLVM-exception", "MIT", "BSD-3-Clause", "BSD-2-Clause"]
+copyleft = "allow"
+allow = ["Apache-2.0", "Apache-2.0 WITH LLVM-exception", "MIT", "BSD-3-Clause", "BSD-2-Clause", "Unlicense", "CC0-1.0"]
+private = { ignore = true }
 
 [bans]