diff --git a/course/modlib.php b/course/modlib.php
index 9c875e32151..434f81c89cd 100644
--- a/course/modlib.php
+++ b/course/modlib.php
@@ -405,10 +405,6 @@ function edit_module_post_actions($moduleinfo, $course) {
         }
     }
 
-    // To be removed (deprecated) with MDL-67526 (both lines).
-    require_once($CFG->libdir.'/plagiarismlib.php');
-    plagiarism_save_form_elements($moduleinfo);
-
     // Allow plugins to extend the course module form.
     $moduleinfo = plugin_extend_coursemodule_edit_post_actions($moduleinfo, $course);
 
diff --git a/lib/deprecatedlib.php b/lib/deprecatedlib.php
index 01194ab3870..16e4abe1c70 100644
--- a/lib/deprecatedlib.php
+++ b/lib/deprecatedlib.php
@@ -3187,6 +3187,27 @@ function user_get_participants($courseid, $groupid, $accesssince, $roleid, $enro
     return $DB->get_recordset_sql("$select $from $where $sort", $params, $limitfrom, $limitnum);
 }
 
+/**
+ * @deprecated Since Moodle 3.9. MDL-65835
+ */
+function plagiarism_save_form_elements() {
+    throw new coding_exception(
+        'Function plagiarism_save_form_elements() has been removed. ' .
+        'Please use {plugin name}_coursemodule_edit_post_actions() instead.'
+    );
+}
+
+/**
+ * @deprecated Since Moodle 3.9. MDL-65835
+ */
+function plagiarism_get_form_elements_module() {
+    throw new coding_exception(
+        'Function plagiarism_get_form_elements_module() has been removed. ' .
+        'Please use {plugin name}_coursemodule_standard_elements() instead.'
+    );
+}
+
+
 /**
  * Returns the list of full course categories to be used in html_writer::select()
  *
diff --git a/lib/plagiarismlib.php b/lib/plagiarismlib.php
index ae89d2558ed..7f1c9f1b827 100644
--- a/lib/plagiarismlib.php
+++ b/lib/plagiarismlib.php
@@ -82,65 +82,6 @@ function plagiarism_get_file_results($cmid, $userid, $file) {
     return $allresults;
 }
 
-/**
- * saves/updates plagiarism settings from a modules config page - called by course/modedit.php
- *
- * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_edit_post_actions() instead.
- * @todo MDL-67526 This is to be moved from here to deprecatedlib.php in Moodle 4.1
- * @param object $data - form data
- */
-function plagiarism_save_form_elements($data) {
-    global $CFG;
-    if (empty($CFG->enableplagiarism)) {
-        return '';
-    }
-    $plagiarismplugins = plagiarism_load_available_plugins();
-    foreach ($plagiarismplugins as $plugin => $dir) {
-        require_once($dir.'/lib.php');
-        $plagiarismclass = "plagiarism_plugin_$plugin";
-        $plagiarismplugin = new $plagiarismclass;
-
-        $reflectionmethod = new ReflectionMethod($plagiarismplugin, 'save_form_elements');
-        if ($reflectionmethod->getDeclaringClass()->getName() == get_class($plagiarismplugin)) {
-            $text = 'plagiarism_plugin::save_form_elements() is deprecated.';
-            $text .= ' Use plagiarism_' . $plugin . '_coursemodule_edit_post_actions() instead';
-            debugging($text, DEBUG_DEVELOPER);
-        }
-
-        $plagiarismplugin->save_form_elements($data);
-    }
-}
-
-/**
- * adds the list of plagiarism settings to a form - called inside modules that have enabled plagiarism
- *
- * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_standard_elements() instead.
- * @todo MDL-67526 This is to be moved from here to deprecatedlib.php in Moodle 4.1
- * @param object $mform - Moodle form object
- * @param object $context - context object
- * @param string $modulename - Name of the module
- */
-function plagiarism_get_form_elements_module($mform, $context, $modulename = "") {
-    global $CFG;
-    if (empty($CFG->enableplagiarism)) {
-        return '';
-    }
-    $plagiarismplugins = plagiarism_load_available_plugins();
-    foreach ($plagiarismplugins as $plugin => $dir) {
-        require_once($dir.'/lib.php');
-        $plagiarismclass = "plagiarism_plugin_$plugin";
-        $plagiarismplugin = new $plagiarismclass;
-
-        $reflectionmethod = new ReflectionMethod($plagiarismplugin, 'get_form_elements_module');
-        if ($reflectionmethod->getDeclaringClass()->getName() == get_class($plagiarismplugin)) {
-            $text = 'plagiarism_plugin::get_form_elements_module() is deprecated.';
-            $text .= ' Use plagiarism_' . $plugin . '_coursemodule_standard_elements() instead';
-            debugging($text, DEBUG_DEVELOPER);
-        }
-
-        $plagiarismplugin->get_form_elements_module($mform, $context, $modulename);
-    }
-}
 /**
  * Allows a plagiarism plugin to print a button/link at the top of activity overview report pages.
  *
@@ -197,12 +138,10 @@ function plagiarism_print_disclosure($cmid) {
 /**
  * Helper function - also loads lib file of plagiarism plugin
  *
- * @todo MDL-67872 the deprecated code in this function to be removed in Moodle 4.1
  * @return array of available plugins
  */
 function plagiarism_load_available_plugins() {
     global $CFG;
-    static $showndeprecatedmessage = array(); // Only show message once per page load.
 
     if (empty($CFG->enableplagiarism)) {
         return array();
@@ -211,18 +150,7 @@ function plagiarism_load_available_plugins() {
     $availableplugins = array();
     foreach ($plagiarismplugins as $plugin => $dir) {
         // Check this plugin is enabled and a lib file exists.
-        if (get_config('plagiarism', $plugin."_use")) {
-            // Deprecated Since Moodle 3.9.
-            $pluginenabled = true;
-            if (empty($showndeprecatedmessage[$plugin])) {
-                $text = 'The setting plagiarism:'.$plugin.'_use is deprecated.';
-                $text .= ' Use plagiarism_' . $plugin . ':enabled instead';
-                debugging($text, DEBUG_DEVELOPER);
-                $showndeprecatedmessage[$plugin] = true;
-            }
-        } else {
-            $pluginenabled = get_config('plagiarism_'.$plugin, 'enabled');
-        }
+        $pluginenabled = get_config('plagiarism_'.$plugin, 'enabled');
         if ($pluginenabled && file_exists($dir."/lib.php")) {
             require_once($dir.'/lib.php');
             $plagiarismclass = "plagiarism_plugin_$plugin";
diff --git a/mod/assign/mod_form.php b/mod/assign/mod_form.php
index 64fdde4b2fd..6af5c1c777d 100644
--- a/mod/assign/mod_form.php
+++ b/mod/assign/mod_form.php
@@ -202,12 +202,6 @@ class mod_assign_mod_form extends moodleform_mod {
         $mform->addElement('selectyesno', 'sendstudentnotifications', $name);
         $mform->addHelpButton('sendstudentnotifications', 'sendstudentnotificationsdefault', 'assign');
 
-        // Plagiarism enabling form. To be removed (deprecated) with MDL-67526.
-        if (!empty($CFG->enableplagiarism)) {
-            require_once($CFG->libdir . '/plagiarismlib.php');
-            plagiarism_get_form_elements_module($mform, $ctx->get_course_context(), 'mod_assign');
-        }
-
         $this->standard_grading_coursemodule_elements();
         $name = get_string('blindmarking', 'assign');
         $mform->addElement('selectyesno', 'blindmarking', $name);
diff --git a/mod/forum/mod_form.php b/mod/forum/mod_form.php
index 37174841848..d1b194e2980 100644
--- a/mod/forum/mod_form.php
+++ b/mod/forum/mod_form.php
@@ -205,10 +205,6 @@ class mod_forum_mod_form extends moodleform_mod {
         $mform->addHelpButton('warnafter', 'warnafter', 'forum');
         $mform->hideIf('warnafter', 'blockperiod', 'eq', 0);
 
-        $coursecontext = context_course::instance($COURSE->id);
-        // To be removed (deprecated) with MDL-67526.
-        plagiarism_get_form_elements_module($mform, $coursecontext, 'mod_forum');
-
 //-------------------------------------------------------------------------------
 
         // Add the whole forum grading options.
diff --git a/mod/workshop/mod_form.php b/mod/workshop/mod_form.php
index f693a2bdd14..f0ecddd6702 100644
--- a/mod/workshop/mod_form.php
+++ b/mod/workshop/mod_form.php
@@ -247,10 +247,6 @@ class mod_workshop_mod_form extends moodleform_mod {
         $label = get_string('assessmentend', 'workshop');
         $mform->addElement('date_time_selector', 'assessmentend', $label, array('optional' => true));
 
-        $coursecontext = context_course::instance($this->course->id);
-        // To be removed (deprecated) with MDL-67526.
-        plagiarism_get_form_elements_module($mform, $coursecontext, 'mod_workshop');
-
         // Common module settings, Restrict availability, Activity completion etc. ----
         $features = array('groups' => true, 'groupings' => true,
                 'outcomes' => true, 'gradecat' => false, 'idnumber' => false);
diff --git a/plagiarism/lib.php b/plagiarism/lib.php
index bc444cc7c71..75753051759 100644
--- a/plagiarism/lib.php
+++ b/plagiarism/lib.php
@@ -72,24 +72,6 @@ abstract class plagiarism_plugin {
     public function get_file_results($cmid, $userid, $file) {
         return array('analyzed' => '', 'score' => '', 'reporturl' => '');
     }
-    /**
-     * hook to add plagiarism specific settings to a module settings page
-     * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_edit_post_actions() instead.
-     * @todo MDL-67526 Remove this method.
-     * @param object $mform  - Moodle form
-     * @param object $context - current context
-     * @param string $modulename - Name of the module
-     */
-    public function get_form_elements_module($mform, $context, $modulename = "") {
-    }
-    /**
-     * hook to save plagiarism specific settings on a module settings page
-     * @deprecated Since Moodle 3.9. MDL-65835 Please use {plugin name}_coursemodule_standard_elements() instead.
-     * @todo MDL-67526 Remove this method.
-     * @param object $data - data from an mform submission.
-     */
-    public function save_form_elements($data) {
-    }
     /**
      * hook to allow a disclosure to be printed notifying users what will happen with their submission
      * @param int $cmid - course module id
diff --git a/plagiarism/upgrade.txt b/plagiarism/upgrade.txt
index e871f36ddf6..0400957f84b 100644
--- a/plagiarism/upgrade.txt
+++ b/plagiarism/upgrade.txt
@@ -1,5 +1,12 @@
 This files describes API changes for code that uses the plagiarism API.
 
+=== 4.2 ===
+* Final deprecation and removal of the following functions:
+  - plagiarism_save_form_elements(), please use {plugin name}_coursemodule_edit_post_actions() instead.
+  - plagiarism_get_form_elements_module(), please use {plugin name}_coursemodule_standard_elements() instead.
+  - plagiarism_plugin::get_form_elements_module(), please use {plugin name}_coursemodule_edit_post_actions() instead.
+  - plagiarism_plugin::save_form_elements(), please use {plugin name}_coursemodule_standard_elements() instead.
+
 === 4.0 ===
 * The method update_status() has been deprecated. Please use {plugin name}_before_standard_top_of_body_html() instead.
 * The method get_configs() has been deprecated and will be removed from the abstract class as it was not used in core.