diff --git a/Cargo.toml b/Cargo.toml
index d03aeeb..ff36fd5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "freemkv-keysources"
-version = "0.29.0"
+version = "0.30.0"
 edition = "2024"
 license = "AGPL-3.0-only"
 description = "Pluggable AACS key sources (keydb, online key service, mapfile) for libfreemkv. Each source looks a disc up and hands libfreemkv a Key; the library does all derivation."
@@ -10,7 +10,7 @@ categories = ["multimedia"]
 
 [dependencies]
 # The crate provides the `KeySource` trait + `Key`/`DiscInputs` types these impls fill.
-libfreemkv = "0.29"
+libfreemkv = "0.30"
 # OnlineSource: POST disc inputs + samples to a key service over HTTP.
 ureq = { version = "2", features = ["json"] }
 serde_json = "1"
diff --git a/src/keydb.rs b/src/keydb.rs
index 0435050..0f3c87e 100644
--- a/src/keydb.rs
+++ b/src/keydb.rs
@@ -127,6 +127,7 @@ mod tests {
             mkb: Vec::new(),
             unit_key_ro: Vec::new(),
             samples: Vec::new(),
+            volume_label: None,
         }
     }
 
diff --git a/src/online.rs b/src/online.rs
index c68bbe0..fc39bbc 100644
--- a/src/online.rs
+++ b/src/online.rs
@@ -54,6 +54,13 @@ impl OnlineSource {
                     .collect(),
             );
         }
+        // The disc's own title (UDF/ISO volume id), plain text. The key service
+        // catalogs it by disc_hash (its disc-titles.json) — independent of keydb.
+        if let Some(label) = inputs.volume_label.as_deref().map(str::trim) {
+            if !label.is_empty() {
+                body["title"] = serde_json::Value::String(label.to_string());
+            }
+        }
         let mut req = ureq::post(&self.base_url).timeout(Duration::from_secs(TIMEOUT_SECS));
         if !self.secret.is_empty() {
             req = req.set("Authorization", &format!("Bearer {}", self.secret));