diff --git a/lib/ddl/database_manager.php b/lib/ddl/database_manager.php
index cee8b934deb..3046c2445d9 100644
--- a/lib/ddl/database_manager.php
+++ b/lib/ddl/database_manager.php
@@ -20,14 +20,16 @@
  * Database manager instance is responsible for all database structure
  * modifications.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  *             2008 Petr Skoda                   http://skodak.org
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 /**
  * Database manager instance is responsible for all database structure
  * modifications. It is using db specific generators to find out
diff --git a/lib/ddl/mssql_sql_generator.php b/lib/ddl/mssql_sql_generator.php
index 823390862ed..b88fdde677a 100644
--- a/lib/ddl/mssql_sql_generator.php
+++ b/lib/ddl/mssql_sql_generator.php
@@ -19,13 +19,15 @@
 /**
  * MSSQL specific SQL code generator.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->libdir.'/ddl/sql_generator.php');
 
 /// This class generate SQL code to be used against MSSQL
diff --git a/lib/ddl/mysql_sql_generator.php b/lib/ddl/mysql_sql_generator.php
index d49ccc87258..d0a4d7d02dc 100644
--- a/lib/ddl/mysql_sql_generator.php
+++ b/lib/ddl/mysql_sql_generator.php
@@ -19,13 +19,15 @@
 /**
  * Mysql specific SQL code generator.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->libdir.'/ddl/sql_generator.php');
 
 /// This class generate SQL code to be used against MySQL
diff --git a/lib/ddl/oracle_sql_generator.php b/lib/ddl/oracle_sql_generator.php
index 48ba6bd46f2..0ce070a31dc 100644
--- a/lib/ddl/oracle_sql_generator.php
+++ b/lib/ddl/oracle_sql_generator.php
@@ -19,13 +19,15 @@
 /**
  * Oracle specific SQL code generator.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->libdir.'/ddl/sql_generator.php');
 
 /// This class generate SQL code to be used against Oracle
diff --git a/lib/ddl/postgres_sql_generator.php b/lib/ddl/postgres_sql_generator.php
index dc93e2a2a77..19611378203 100644
--- a/lib/ddl/postgres_sql_generator.php
+++ b/lib/ddl/postgres_sql_generator.php
@@ -19,13 +19,15 @@
 /**
  * PostgreSQL specific SQL code generator.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->libdir.'/ddl/sql_generator.php');
 
 /// This class generate SQL code to be used against PostgreSQL
diff --git a/lib/ddl/sql_generator.php b/lib/ddl/sql_generator.php
index 1957dbeebfd..a0f629879cf 100644
--- a/lib/ddl/sql_generator.php
+++ b/lib/ddl/sql_generator.php
@@ -23,13 +23,15 @@
  * The rest of classes will inherit, by default, the same logic.
  * Functions will be overridden as needed to generate correct SQL.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 /**
  * Abstract sql generator class, base for all db specific implementations.
  */
diff --git a/lib/ddl/sqlite_sql_generator.php b/lib/ddl/sqlite_sql_generator.php
index a299a1d4a9e..9655d70d525 100644
--- a/lib/ddl/sqlite_sql_generator.php
+++ b/lib/ddl/sqlite_sql_generator.php
@@ -19,12 +19,14 @@
 /**
  * Experimental SQLite specific SQL code generator.
  *
- * @package    moodlecore
- * @subpackage DDL
+ * @package    core
+ * @subpackage ddl
  * @copyright  2008 Andrei Bautu
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->libdir.'/ddl/sql_generator.php');
 
 /// This class generate SQL code to be used against SQLite