diff --git a/api.php b/api.php
index 53d56ae..9f8a351 100644
--- a/api.php
+++ b/api.php
@@ -849,12 +849,12 @@ switch($request[0]) {
 
 			default:
 				$ret['status']="error";
-				$ret['error']="invalidi school API command ({$request[1]})";
+				$ret['error']="invalid school API command ({$request[1]})";
 		}
 	break;
 
 	case 'project':
-		$chk=api_user_auth_required();
+		$chk=api_user_auth_required('participant');
 		if($chk['status']!="ok") {
 			$ret['status']="error";
 			$ret['error']=$chk['error'];
diff --git a/register_participants_signature.php b/register_participants_signature.php
index 5a1b614..bd0714a 100644
--- a/register_participants_signature.php
+++ b/register_participants_signature.php
@@ -41,14 +41,12 @@
 		exit;
 	}
 
-	 $q=mysql_query("SELECT registrations.id AS regid, students.id AS studentid, students.firstname 
-	 			FROM registrations,students
-		 		WHERE students.email='{$_SESSION['email']}' 
-				AND registrations.num='{$_SESSION['registration_number']}'
+	 $q=mysql_query("SELECT registrations.id AS regid
+	 			FROM registrations
+				WHERE registrations.num='{$_SESSION['registration_number']}'
 				AND registrations.id='{$_SESSION['registration_id']}'
-				AND students.registrations_id=registrations.id
-				AND registrations.conferences_id={$conference['id']}
-				AND students.conferences_id={$conference['id']}");
+				AND registrations.conferences_id={$conference['id']}");
+
 	$registration_number=$_SESSION['registration_number'];
 	$registration_id=$_SESSION['registration_id'];