diff --git a/classes/premium.php b/classes/premium.php
index e73f8de..b8c6271 100644
--- a/classes/premium.php
+++ b/classes/premium.php
@@ -125,18 +125,39 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
         }
     }
 
-
+    /**
+     * Check if premium status is enabled
+     * @return bool
+     */
     public static function enabled() {
         $status = self::premiumStatus();
         return $status->enabled;
     }
 
+    /**
+     * Check if the premium key includes a specific intent in addition to the treestudyplan.
+     * @param string $intent The intent to search for
+     * @return bool
+     */
+    public static function has_intent($intent){
+        $status = self::premiumStatus();
+        if ($status->enabled) {
+            return \in_array(\strtolower($intent),$status->intents);
+        } else {
+            return false;
+        }
+    }
+
+    /** 
+     * Determine, cache and retrieve premium status
+     * @return object
+     */
     protected static function premiumStatus() {
         if (!isset(self::$cachedpremiumstatus)) {
             // Initialize default object.
             $o = new \stdClass;
             $o->enabled = false;
-            $o->intent = "";
+            $o->intents = [];
             $o->name = "";
             $o->website = "";
             $o->expires = "";
@@ -155,14 +176,19 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
 
                     if (is_object($decoded)) {
 
-                        $keys = ["intent","name","website","expires","issued"];
+                        // Copy basic data/
+                        $keys = ["name","website","expires","issued"];
                         foreach ( $keys as  $k) {
                             if (isset($decoded->$k)) {
                                 $o->$k = $decoded->$k;
                             }
                         }
 
-                        // Convert dates to user dates
+                        if(!empty($decoded->intent)) {
+                            $o->intents = explode(",",$decoded->intent);
+                        }
+
+                        // Convert dates to DateTime for 
                         $now = new \DateTime();
                         $issuedate = new \DateTime($o->issued);
                         $expirydate = new \DateTime(); // Default to now
@@ -174,7 +200,10 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
                                 $expirydate = new \DateTime($o->expires);
                             } catch (\Exception $x) {}
                         }
-                        if ($o->intent == 'treestudyplan' 
+
+
+
+                        if ( \in_array('treestudyplan',$o->intents)
                             && !empty($o->issued)
                             && self::website_match($o->website)
                             ) {
@@ -205,15 +234,18 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
         return self::$cachedpremiumstatus;
     }
 
+    /**
+     * Check if the current site matches the provided key
+     */
     private static function website_match($key) {
         global $CFG;
         $site = $CFG->wwwroot;
         // Add double slashes to key and site if no scheme is set.
         // Basically: if no double slashes present before any dots,shashes or @s.
-        if(!preg_match_all('#^[^./@]*?//#',$key )) {
+        if(!\preg_match_all('#^[^./@]*?//#',$key )) {
             $key = "//".$key;
         }
-        if(!preg_match_all('#^[^./@]*?//#',$site)) {
+        if(!\preg_match_all('#^[^./@]*?//#',$site)) {
             $site = "//".$site;
         }
         // Use parse_url() to split path and host.
@@ -222,26 +254,16 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
 
         // No match if host is empty on key or site
         if (empty($keyurl->host) || empty($siteurl->host)) {
-            if(empty($keyurl->host)){
-                print "\e[91mError: no host in keyurl '{$key}'\n";
-                print_r($keyurl);
-                print "\e[0m";
-            }
-            if(empty($siteurl->host)){
-                print "\e[91mError: no host in siteurl '{$site}'\n";
-                print_r($siteurl);
-                print "\e[0m";
-            }
             return false;
         }
 
         // First match the host part.
-        $keyparts = array_reverse(explode(".",$keyurl->host));
-        $siteparts = array_reverse(explode(".",$siteurl->host));
+        $keyparts = \array_reverse(\explode(".",$keyurl->host));
+        $siteparts = \array_reverse(\explode(".",$siteurl->host));
 
         // Trim starting www from both parts, since site.domain and www.site.domain should be treated as the same.
-        if (($x = array_pop($keyparts)) != "www") {array_push($keyparts,$x);}
-        if (($x = array_pop($siteparts)) != "www") {array_push($siteparts,$x);}
+        if (($x = \array_pop($keyparts)) != "www") {\array_push($keyparts,$x);}
+        if (($x = \array_pop($siteparts)) != "www") {\array_push($siteparts,$x);}
 
         for ($i = 0; $i < count($keyparts); $i++) {
             // No match if the site does not have a part, but the key does. Unless the key part is *
@@ -271,10 +293,10 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
         $sitepath = empty($siteurl->path)?"/":$siteurl->path;
         
         // Trim trailing / from both paths before comparison
-        if (strlen($sitepath) > 1) {
+        if (\strlen($sitepath) > 1) {
             $sitepath = \rtrim($sitepath,"/");
         }
-        if (strlen($keypath) > 1) {
+        if (\strlen($keypath) > 1) {
             $keypath = \rtrim($keypath,"/");
         }
 
@@ -282,6 +304,9 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
         return \fnmatch($keypath,$sitepath,\FNM_CASEFOLD);
     }
 
+    /**
+     * Parameter description for webservice function get_premiumstatus
+     */
     public static function get_premiumstatus_parameters() : \external_function_parameters {
         return new \external_function_parameters([]);
     }
@@ -296,6 +321,7 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
             "name"      => new \external_value(PARAM_TEXT, 'premium registration name'),
             "expires"   => new \external_value(PARAM_TEXT, 'premium registration expiry date'),
             "expired"   => new \external_value(PARAM_BOOL, 'premium status expired'),
+            "intents"   => new \external_multiple_structure(new \external_value(PARAM_TEXT),'additional intents included in the license '),
         ]);
     }
 
@@ -311,6 +337,7 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
             "name",
             "expires",
             "expired",
+            "intents",
         ];
         
         $result = [];
@@ -320,6 +347,10 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
         return $result;
     }
 
+    /**
+     * Get a descriptive text of the current premium status
+     * @return string HTML description of premium status.
+     */
     public static function statusdescription() {
         $status = self::premiumStatus();
 
@@ -330,13 +361,15 @@ Klc5I28bGbvxIV5pnL6ZSjHEDp2WreM8HB0XFJwU+Q==
         if ($status->website != "*") {
             $msg->sitestatus = \get_string("premium:onsite",'local_treestudyplan',$status);
         } else {
-            $msg->sitestatus = "";
+            $msg->sitestatus = \get_string("premium:anywhere",'local_treestudyplan');;
         }
 
         if($status->enabled) {
             return \get_string("premium:active",'local_treestudyplan',$msg);
         } else if ($status->expired) {
             return \get_string("premium:expired",'local_treestudyplan',$msg);
+        } else if (!self::website_match($status->website)) {
+            return \get_string("premium:siteinvalid",'local_treestudyplan',$status->website);
         } else {
             return \get_string("premium:notregistered",'local_treestudyplan',$msg);
         }
diff --git a/lang/en/local_treestudyplan.php b/lang/en/local_treestudyplan.php
index e5e759e..bba2649 100644
--- a/lang/en/local_treestudyplan.php
+++ b/lang/en/local_treestudyplan.php
@@ -436,10 +436,12 @@ $string["error:nostudyplaneditaccess"] = 'Error: You do not have access to manag
 $string["error:nocategoriesvisible"] = 'Error: You have no viewing permissions in any category. Therefore the course list remains empty.';
 
 $string["premium:never"] = 'never';
+$string["premium:anywhere"] = 'for use anywhere';
 $string["premium:onsite"] = 'for use on site <b>{$a->website}</b>';
 $string["premium:active"] = 'Premium access <b class="text-success">enabled</b>.<br> Registered to <b>{$a->name}</b> {$a->sitestatus}<br>Expires <b>{$a->expires}</b>';
 $string["premium:notregistered"] = 'Premium access <b>disabled</b> ';
 $string["premium:invalidactivationcontent"] = 'Premium activation key not recognized';
+$string["premium:siteinvalid"] = 'Premium access <b>disabled</b>. Activation key is only valid for use on <b>{$a}</b>';
 $string["premium:expired"] = 'Premium access <b class="text-danger">expired</b> on <b>{$a->expires}</b><br>Was registered to <b>{$a->name}</b> {$a->sitestatus}';
 $string["settingspage_premium"] = 'Premium registration';
 $string["setting_premium_heading"] = 'Premium features';
@@ -447,11 +449,13 @@ $string["settingdesc_premium_heading"] = 'To access premium features, you need a
 <br>Premium features include:
 <ul>
 <li>Creating more than 5 studyplans per category</li>
+<li>Creating studyplans in more than 20 categories</li>
 <li>Overview of grades for all students in a studyplan</li>
-<li>Rows in a studplan which a student can choose to unlock</li>
+<li>Rows in a studyplan which a student can choose to unlock</li>
 </ul>';
 $string["setting_premium_status"] = 'Current premium status';
 $string["setting_premium_key"] = 'Activation key';
 $string["settingdesc_premium_key"] = 'Paste the premium key you received in the box above.';
 
-$string["premiumfeature:morestudyplans"] = 'Creating more than 5 studyplans in a single category is a premium feature.';
\ No newline at end of file
+$string["premiumfeature:morestudyplans"] = 'Creating more than 5 studyplans in a single category is a premium feature.';
+$string["premiumfeature:morecategories"] = 'Creating studyplans in more than 20 categories is a premium feature.';
\ No newline at end of file
diff --git a/lang/nl/local_treestudyplan.php b/lang/nl/local_treestudyplan.php
index d4cab91..919098b 100644
--- a/lang/nl/local_treestudyplan.php
+++ b/lang/nl/local_treestudyplan.php
@@ -436,10 +436,12 @@ $string["error:nostudyplaneditaccess"] = 'Fout: Je hebt geen rechten om studiepl
 $string["error:nocategoriesvisible"] = 'Fout: Je kunt geen cursussen in een categorie bekijken. Daarom blijft de cursuslijst leeg';
 
 $string["premium:never"] = 'nooit';
-$string["premium:onsite"] = 'voor site {$a->website}';
+$string["premium:anywhere"] = 'voor gebruik overal';
+$string["premium:onsite"] = 'voor gebruik op {$a->website}';
 $string["premium:active"] = 'Premium toegang <b class="text-success">ingeschakeld</b>.<br>Uitgegeven aan <b>{$a->name}</b> {$a->sitestatus}<br>Verloopt op<b>{$a->expires}</b>';
 $string["premium:notregistered"] = 'Premium toegang staat <b>uitgeschakeld</n>';
 $string["premium:invalidactivationcontent"] = 'Premium activeringssleutel niet herkend';
+$string["premium:siteinvalid"] = 'Premium toegang staat <b>uitgeschakeld</n>. Activeringssleutel is alleen voor gebruik op <b>{$a}</b>';
 $string["premium:expired"] = 'Premium toegang is <b class="text-danger">verlopen</b> op <b>{$a->expires}</b><br>Was uitgegeven aan <b>{$a->name}</b> {$a->sitestatus}';
 $string["settingspage_premium"] = 'Premium registration';
 $string["setting_premium_heading"] = 'Premium features';
@@ -447,6 +449,7 @@ $string["settingdesc_premium_heading"] = 'Voor premium toegang is een activering
 <br>Premium toegang bevat onder andere:
 <ul>
 <li>Meer dan 5 studieplannen per categorie aan kunnen maken</li>
+<li>In meer dan 20 categorieën studieplannen kunnen aanmaken</li>
 <li>Overzichtsrapport van alle resultaten van studenten in een studieplan</li>
 <li>Leerlijnen die student kan ontsluiten</li>
 </ul>';
@@ -454,4 +457,5 @@ $string["setting_premium_status"] = 'Premium status';
 $string["setting_premium_key"] = 'Activation key';
 $string["settingdesc_premium_key"] = 'Premium activation key';
 
-$string["premiumfeature:morestudyplans"] = 'Meer dan 5 studieplannen in één categorie aanmaken kan alleen met premium toegang.';
\ No newline at end of file
+$string["premiumfeature:morestudyplans"] = 'Meer dan 5 studieplannen in één categorie aanmaken kan alleen met premium toegang.';
+$string["premiumfeature:morecategories"] = 'In meer dan 20 categoriën een studieplan aanmaken kan alleen met premium toegang.';
\ No newline at end of file