PHP plugin / library / repository for Password Protecting PDF files

password-protect-pdf-php.php

/*
Installation:
composer require madnh/fpdi-protection
composer require setasign/fpdf:1.8
composer require setasign/fpdi:1.6.2
*/

//PHP function to implement the basic password protection, code is self explanatory 
```php
public function pdfEncrypt($origFile, $destFile, $password_user, $password_owner)
	{
		class_exists('TCPDF', true); // trigger Composers autoloader to load the TCPDF class
		$pdf = new \FPDI_Protection();

		//calculate the number of pages from the original document
		$pagecount = $pdf->setSourceFile($origFile);

		// copy all pages from the old unprotected pdf in the new one
		for ($loop = 1; $loop <= $pagecount; $loop++) {
			$tplidx = $pdf->importPage($loop);
			$pdf->addPage();
			$pdf->useTemplate($tplidx);
		}

		// protect the new pdf file, and allow no printing, copy etc and leave only reading allowed
		$pdf->SetProtection(0, $password_user, $password_owner);
		$pdf->Output($destFile, "F");

		return $destFile;
	}
```