diff --git a/README.md b/README.md
index e237399..45cfc57 100644
--- a/README.md
+++ b/README.md
@@ -262,6 +262,7 @@ services:
       #- METADATA_URL=https://onepacerr.com/api/v1
       #- METADATA_LANGUAGE=en
       #- METADATA_POSTER_SET=default
+      #- METADATA_NFO_LOCKDATA=false
       #- METADATA_DISABLE_WEBSOCKET=false
       #- METADATA_CHECK_INTERVAL=3600
     volumes:
@@ -493,6 +494,7 @@ If you're not sure what Mount Path Mappings are you can have a read on [TRaSH Gu
 | `METADATA_URL` | `https://onepacerr.com/api/v1` | Metadata API url (untested with different ones). |
 | `METADATA_LANGUAGE` | `en` | Currently only language supported. |
 | `METADATA_POSTER_SET` | `default` | Currently `default` equals `piratezekk`. There are also `official` and `mizzoufan523` available. If a set is missing a poster it uses `default`. |
+| `METADATA_NFO_LOCKDATA` | `false` | If `true`, generated `.nfo` files include `<lockdata>true</lockdata>` so media servers can preserve their metadata. |
 | `METADATA_DISABLE_WEBSOCKET` | `false` | If `true`, disables WebSocket mode. NOT recommended but available if your setup doesn't allow WebSockets or Long Polling (also supported). |
 | `METADATA_CHECK_INTERVAL` | 3600 | Ignored if METADATA_DISABLE_WEBSOCKET is false (default). Seconds between checking for new metadata. |
 
diff --git a/sample.env b/sample.env
index 438bb82..9ff04d7 100644
--- a/sample.env
+++ b/sample.env
@@ -182,6 +182,8 @@ TORRENT_CHECK_INTERVAL=60
 #METADATA_LANGUAGE=en
 # Currently `default` equals `piratezekk`. There are also `official` and `mizzoufan523` available. If a set is missing a poster it uses `default`.
 #METADATA_POSTER_SET=default
+# Set to true to write <lockdata>true</lockdata> in generated NFO files.
+#METADATA_NFO_LOCKDATA=false
 # If `true`, disables WebSocket mode. NOT recommended but available if your setup doesn't allow WebSockets or Long Polling (also supported)
 #METADATA_DISABLE_WEBSOCKET=false
 # Ignored if METADATA_DISABLE_WEBSOCKET is false (default). Seconds between checking for new metadata.
diff --git a/src/environment.ts b/src/environment.ts
index 91c338e..fc70a1b 100644
--- a/src/environment.ts
+++ b/src/environment.ts
@@ -186,6 +186,9 @@ export default {
 	METADATA_URL: process.env.METADATA_URL || `https://onepacerr.com/api/v1`,
 	METADATA_LANGUAGE: process.env.METADATA_LANGUAGE || 'en',
 	METADATA_POSTER_SET: process.env.METADATA_POSTER_SET || 'default',
+	METADATA_NFO_LOCKDATA: /true/i.test(
+		process.env.METADATA_NFO_LOCKDATA || 'false',
+	),
 	METADATA_DISABLE_WEBSOCKET: /true/i.test(
 		process.env.METADATA_DISABLE_WEBSOCKET || 'false',
 	),
diff --git a/src/metadata/metadata.controller.ts b/src/metadata/metadata.controller.ts
index 2d79074..a6cc8af 100644
--- a/src/metadata/metadata.controller.ts
+++ b/src/metadata/metadata.controller.ts
@@ -381,7 +381,7 @@ export class MetadataController {
 					//@ts-ignore
 					mpaa: this.metadata.mpaa || this.metadata.customRating,
 					customRating: this.metadata.mpaa || this.metadata.customRating,
-					lockdata: false,
+					lockdata: environment.METADATA_NFO_LOCKDATA,
 					namedseason: namedseason,
 					art: {
 						poster: path,
@@ -423,7 +423,7 @@ export class MetadataController {
 				outline: arc.description,
 				mpaa: this.metadata.mpaa || this.metadata.customRating,
 				customRating: this.metadata.mpaa || this.metadata.customRating,
-				lockdata: false,
+				lockdata: environment.METADATA_NFO_LOCKDATA,
 				art: {
 					poster: path,
 				},
@@ -480,7 +480,7 @@ export class MetadataController {
 
 					mpaa: this.metadata.mpaa || this.metadata.customRating,
 					customrating: this.metadata.mpaa || this.metadata.customRating,
-					lockdata: false,
+					lockdata: environment.METADATA_NFO_LOCKDATA,
 				}
 
 				if (episode.released)