diff --git a/backend/src/index.ts b/backend/src/index.ts
index 4c7fe4e..d5728bb 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -8,14 +8,23 @@ import authRoutes from "./routes/auth.routes";
 import videoRoutes from "./routes/video.routes";
 import playlistRoutes from "./routes/playlist.routes";
 import adminRoutes from "./routes/admin.routes";
+import streamRoutes from "./routes/stream.routes";
 
 dotenv.config();
 
 const app = express();
 const PORT = parseInt(process.env.PORT ?? "4000");
 
+const allowedOrigins = (process.env.FRONTEND_URL ?? "http://localhost:5173")
+  .split(",")
+  .map((o) => o.trim());
+
 app.use(cors({
-  origin: process.env.FRONTEND_URL ?? "http://localhost:3000",
+  origin: (origin, cb) => {
+    // Autoriser les requêtes sans origin (curl, Postman, same-origin)
+    if (!origin || allowedOrigins.includes(origin)) return cb(null, true);
+    cb(new Error(`CORS: origin ${origin} not allowed`));
+  },
   credentials: true,
 }));
 app.use(express.json());
@@ -29,6 +38,7 @@ app.use("/api/auth", authRoutes);
 app.use("/api/videos", videoRoutes);
 app.use("/api/playlists", playlistRoutes);
 app.use("/api/admin", adminRoutes);
+app.use("/api/stream", streamRoutes);
 
 AppDataSource.initialize()
   .then(() => {
diff --git a/backend/src/routes/admin.routes.ts b/backend/src/routes/admin.routes.ts
index c20b501..d740823 100644
--- a/backend/src/routes/admin.routes.ts
+++ b/backend/src/routes/admin.routes.ts
@@ -342,4 +342,59 @@ router.patch("/plans/:id", async (req: Request, res: Response): Promise<void> =>
   }
 });
 
+// ---------------------------------------------------------------------------
+// USER SUBSCRIPTIONS
+// ---------------------------------------------------------------------------
+
+/**
+ * POST /api/admin/users/:id/subscriptions
+ * Assigne un plan à un utilisateur.
+ * Expire l'abonnement actif précédent si existant.
+ * Body: { planId, endsAt? } — endsAt ISO string, null = permanent
+ */
+router.post("/users/:id/subscriptions", async (req: Request, res: Response): Promise<void> => {
+  const { planId, endsAt = null } = req.body as { planId?: string; endsAt?: string | null };
+
+  if (!planId) {
+    res.status(400).json({ success: false, error: "MISSING_PLAN_ID" });
+    return;
+  }
+
+  try {
+    const userRepo = AppDataSource.getRepository(User);
+    const planRepo = AppDataSource.getRepository(SubscriptionPlan);
+    const subRepo  = AppDataSource.getRepository(UserSubscription);
+
+    const [user, plan] = await Promise.all([
+      userRepo.findOne({ where: { id: req.params.id } }),
+      planRepo.findOne({ where: { id: planId } }),
+    ]);
+
+    if (!user) { res.status(404).json({ success: false, error: "USER_NOT_FOUND" }); return; }
+    if (!plan) { res.status(404).json({ success: false, error: "PLAN_NOT_FOUND" }); return; }
+
+    // Expirer l'abonnement actif précédent
+    await subRepo
+      .createQueryBuilder()
+      .update(UserSubscription)
+      .set({ status: "expired" })
+      .where("userId = :userId AND status = :status", { userId: user.id, status: "active" })
+      .execute();
+
+    const sub = subRepo.create({
+      id: crypto.randomUUID(),
+      userId: user.id,
+      planId: plan.id,
+      status: "active",
+      startsAt: new Date(),
+      endsAt: endsAt ? new Date(endsAt) : null,
+    });
+
+    await subRepo.save(sub);
+    res.status(201).json({ success: true, data: { subscription: { ...sub, plan } } });
+  } catch {
+    res.status(500).json({ success: false, error: "INTERNAL_ERROR" });
+  }
+});
+
 export default router;
diff --git a/backend/src/routes/stream.routes.ts b/backend/src/routes/stream.routes.ts
new file mode 100644
index 0000000..9ca029b
--- /dev/null
+++ b/backend/src/routes/stream.routes.ts
@@ -0,0 +1,136 @@
+import { Router, Request, Response } from "express";
+import path from "path";
+import fs from "fs";
+import { AppDataSource } from "../config/data-source";
+import { Video } from "../entities/Video";
+import { User } from "../entities/User";
+import { UserSubscription } from "../entities/UserSubscription";
+
+const router = Router();
+
+const UPLOADS_DIR = process.env.UPLOADS_DIR ?? path.join(process.cwd(), "uploads");
+
+async function getUserLevel(token: string | undefined): Promise<number> {
+  if (!token) return 0;
+
+  try {
+    const superOAuthUrl = process.env.SUPER_OAUTH_URL;
+    if (!superOAuthUrl) return 0;
+
+    const res = await fetch(`${superOAuthUrl}/api/v1/auth/token/validate`, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ token }),
+    });
+
+    const data = await res.json() as {
+      success: boolean;
+      data?: { valid: boolean; user?: { id: string } };
+    };
+
+    if (!data.data?.valid || !data.data.user) return 0;
+
+    const superOAuthId = data.data.user.id;
+    const dbUser = await AppDataSource.getRepository(User).findOne({ where: { superOAuthId } });
+    if (!dbUser) return 0;
+
+    const sub = await AppDataSource.getRepository(UserSubscription).findOne({
+      where: { userId: dbUser.id, status: "active" },
+      relations: ["plan"],
+      order: { startsAt: "DESC" },
+    });
+
+    return sub?.plan.level ?? 0;
+  } catch {
+    return 0;
+  }
+}
+
+/**
+ * GET /api/stream/:key
+ * Sert un fichier local (storageType="local") avec contrôle d'accès.
+ * :key est le chemin relatif stocké en DB (ex: "uploads/my-video.mp4").
+ *
+ * Support Range requests pour la seekabilité vidéo.
+ */
+router.get("/:key(*)", async (req: Request, res: Response): Promise<void> => {
+  const key = req.params.key;
+
+  // Sécurité : interdire path traversal
+  const resolved = path.resolve(UPLOADS_DIR, key);
+  if (!resolved.startsWith(path.resolve(UPLOADS_DIR))) {
+    res.status(400).json({ success: false, error: "INVALID_KEY" });
+    return;
+  }
+
+  try {
+    // Vérifier que la vidéo existe en DB et récupérer son niveau requis
+    const video = await AppDataSource.getRepository(Video).findOne({
+      where: { storageKey: key, storageType: "local", isPublished: true },
+    });
+
+    if (!video) {
+      res.status(404).json({ success: false, error: "NOT_FOUND" });
+      return;
+    }
+
+    // Contrôle d'accès
+    const token =
+      req.headers.authorization?.split(" ")[1] ??
+      (req.cookies as Record<string, string>)?.od_token;
+
+    const userLevel = await getUserLevel(token);
+
+    if (video.requiredLevel > userLevel) {
+      res.status(403).json({ success: false, error: "INSUFFICIENT_PLAN" });
+      return;
+    }
+
+    // Vérifier que le fichier existe
+    if (!fs.existsSync(resolved)) {
+      res.status(404).json({ success: false, error: "FILE_NOT_FOUND" });
+      return;
+    }
+
+    const stat = fs.statSync(resolved);
+    const fileSize = stat.size;
+    const ext = path.extname(resolved).toLowerCase();
+
+    const mimeTypes: Record<string, string> = {
+      ".mp4": "video/mp4",
+      ".webm": "video/webm",
+      ".m3u8": "application/vnd.apple.mpegurl",
+      ".ts": "video/MP2T",
+    };
+    const contentType = mimeTypes[ext] ?? "application/octet-stream";
+
+    const range = req.headers.range;
+
+    if (range) {
+      const parts = range.replace(/bytes=/, "").split("-");
+      const start = parseInt(parts[0], 10);
+      const end = parts[1] ? parseInt(parts[1], 10) : fileSize - 1;
+      const chunkSize = end - start + 1;
+
+      res.writeHead(206, {
+        "Content-Range": `bytes ${start}-${end}/${fileSize}`,
+        "Accept-Ranges": "bytes",
+        "Content-Length": chunkSize,
+        "Content-Type": contentType,
+      });
+
+      fs.createReadStream(resolved, { start, end }).pipe(res);
+    } else {
+      res.writeHead(200, {
+        "Content-Length": fileSize,
+        "Content-Type": contentType,
+        "Accept-Ranges": "bytes",
+      });
+      fs.createReadStream(resolved).pipe(res);
+    }
+  } catch {
+    res.status(500).json({ success: false, error: "INTERNAL_ERROR" });
+  }
+});
+
+export default router;