Search for the following functions and make sure it is only used in lib/deprecatelib.php and it throws an exception. clam_change_log clam_log_infected clam_log_upload clam_replace_infected_file Search for the following functions and make sure it is only used in lib/uploadlib.php and it throws an exception. clam_scan_moodle_file clam_handle_infected_file Search for usages of upload_manager class and make sure it is only used in lib/uploadlib.php and the constructor method throws an exception. NOTE: There are two clam methods not deprecated in lib/uploadlib.php and it is only used by repository/lib.php .