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PhpSpreadsheet - Add Workbook Password

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I have the following script that looks to make an excel document using PHPSpreadsheet... the script works great, but it doesn't apply the password to the workbook... what am I missing?

use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
// Information
$arrayData[] = array('cells');

// Make File Name
$filename = 'file-'.time().'.xlsx';

$spreadsheet = new Spreadsheet();

$security = $spreadsheet->getSecurity();

$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'Report Generated '. date(DATE_FORMAT_LONG));
$sheet->fromArray($arrayData, NULL, 'A3');

header('Content-Disposition: attachment;filename='.$filename);

$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Xlsx');



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I tried adding that code but it still doesn't seem to password protect the actual document...

Just unable to edit a sheet or cell...

$security = $spreadsheet->getSecurity();


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