diff --git a/README.md b/README.md
index 187b1e9..2a1ae62 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ WC Licensed Product adds a new product type "Licensed Product" to WooCommerce, e
 - **Version Binding**: Optional binding to major software versions
 - **Expiration Support**: Set license validity periods or lifetime licenses
 - **Rate Limiting**: API endpoints protected with configurable rate limiting (default: 30 requests/minute)
+- **Frontend Rate Limiting**: Transfer requests (5/hour) and downloads (30/hour) protected against abuse
 - **Trusted Proxy Support**: Configurable trusted proxies for accurate rate limiting behind CDNs
 - **Checkout Blocks**: Full support for WooCommerce Checkout Blocks (default since WC 8.3+)
 - **Self-Licensing**: The plugin can validate its own license (for commercial distribution)
@@ -132,17 +133,26 @@ When a customer purchases a licensed product, they must enter the domain where t
 3. Upload a CSV file (supports exported format or simplified format)
 4. Choose options: skip header row, update existing licenses
 
+**Import Limits (Security):**
+
+- Maximum file size: 2MB
+- Maximum rows per import: 1000
+- Cooldown between imports: 5 minutes
+
 ## Security
 
 The plugin implements several security best practices:
 
 - **Input Sanitization**: All user inputs are sanitized using WordPress functions
 - **Output Escaping**: All output is escaped to prevent XSS attacks
+- **XSS-Safe DOM Construction**: JavaScript uses `createElement()` and `textContent` instead of `innerHTML`
 - **CSRF Protection**: Nonce verification on all forms and AJAX requests
 - **SQL Injection Prevention**: All database queries use prepared statements
 - **Capability Checks**: Admin functions require `manage_woocommerce` capability
 - **Secure Downloads**: File downloads use hash-verified URLs with user authentication
 - **Response Signing**: Optional HMAC-SHA256 signatures for API tamper protection
+- **Rate Limiting**: API and frontend operations protected against abuse
+- **Import Limits**: CSV imports limited by file size, row count, and cooldown period
 
 ### Trusted Proxy Configuration
 
diff --git a/docs/server-implementation.md b/docs/server-implementation.md
index 71add02..4e61e96 100644
--- a/docs/server-implementation.md
+++ b/docs/server-implementation.md
@@ -21,7 +21,7 @@ This prevents attackers from:
 
 ## Requirements
 
-- PHP 7.4+ (8.0+ recommended)
+- PHP 8.3+
 - A server secret stored securely (not in version control)
 
 ## Server Configuration
@@ -51,25 +51,33 @@ php -r "echo bin2hex(random_bytes(32));"
 
 ### Key Derivation
 
-Each license key gets a unique signing key derived from the server secret:
+Each license key gets a unique signing key derived from the server secret using RFC 5869 HKDF:
 
 ```php
 /**
  * Derive a unique signing key for a license.
  *
- * @param string $licenseKey The license key
- * @param string $serverSecret The server's master secret
- * @return string The derived key (hex encoded)
+ * Uses PHP's native hash_hkdf() function per RFC 5869.
+ *
+ * @param string $licenseKey The license key (used as "info" context)
+ * @param string $serverSecret The server's master secret (used as IKM)
+ * @return string The derived key (hex encoded, 64 characters)
  */
 function derive_signing_key(string $licenseKey, string $serverSecret): string
 {
-    // HKDF-like key derivation
-    $prk = hash_hmac('sha256', $licenseKey, $serverSecret, true);
-
-    return hash_hmac('sha256', $prk . "\x01", $serverSecret);
+    // HKDF key derivation per RFC 5869
+    // IKM: server_secret, Length: 32 bytes, Info: license_key
+    return bin2hex(hash_hkdf('sha256', $serverSecret, 32, $licenseKey));
 }
 ```
 
+**Important:** This uses PHP's native `hash_hkdf()` function (available since PHP 7.1.2). The parameters are:
+
+- **Algorithm:** sha256
+- **IKM (Input Keying Material):** server_secret
+- **Length:** 32 bytes (256 bits)
+- **Info:** license_key (context-specific information)
+
 ### Response Signing
 
 Sign every API response before sending:
@@ -88,8 +96,8 @@ function sign_response(array $responseData, string $licenseKey, string $serverSe
     $timestamp = time();
     $signingKey = derive_signing_key($licenseKey, $serverSecret);
 
-    // Sort keys for consistent ordering
-    ksort($responseData);
+    // Recursively sort keys for consistent ordering (important for nested arrays!)
+    $responseData = recursive_key_sort($responseData);
 
     // Build signature payload
     $jsonBody = json_encode($responseData, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
@@ -103,6 +111,20 @@ function sign_response(array $responseData, string $licenseKey, string $serverSe
         'X-License-Timestamp' => (string) $timestamp,
     ];
 }
+
+/**
+ * Recursively sort array keys alphabetically.
+ */
+function recursive_key_sort(array $data): array
+{
+    ksort($data);
+    foreach ($data as $key => $value) {
+        if (is_array($value)) {
+            $data[$key] = recursive_key_sort($value);
+        }
+    }
+    return $data;
+}
 ```
 
 ### WordPress REST API Integration
@@ -214,7 +236,7 @@ class ResponseSigner
         $timestamp = time();
         $signingKey = $this->deriveKey($licenseKey);
 
-        ksort($data);
+        $data = $this->recursiveKeySort($data);
         $payload = $timestamp . ':' . json_encode(
             $data,
             JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE
@@ -226,11 +248,21 @@ class ResponseSigner
         ];
     }
 
+    private function recursiveKeySort(array $data): array
+    {
+        ksort($data);
+        foreach ($data as $key => $value) {
+            if (is_array($value)) {
+                $data[$key] = $this->recursiveKeySort($value);
+            }
+        }
+        return $data;
+    }
+
     private function deriveKey(string $licenseKey): string
     {
-        $prk = hash_hmac('sha256', $licenseKey, $this->serverSecret, true);
-
-        return hash_hmac('sha256', $prk . "\x01", $this->serverSecret);
+        // HKDF key derivation per RFC 5869
+        return bin2hex(hash_hkdf('sha256', $this->serverSecret, 32, $licenseKey));
     }
 }
 
@@ -262,8 +294,8 @@ signature = HMAC-SHA256(
 
 Where:
 
-- `derive_signing_key` uses HKDF-like derivation (see above)
-- `canonical_json` sorts keys alphabetically, no escaping of slashes/unicode
+- `derive_signing_key` uses RFC 5869 HKDF: `hash_hkdf('sha256', server_secret, 32, license_key)`
+- `canonical_json` recursively sorts keys alphabetically, no escaping of slashes/unicode
 - Result is hex-encoded (64 characters)
 
 ## Testing