diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 9de6dcd5c1c..8244622a545 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -150,14 +150,14 @@ function pdf_getInstance($format='',$metric='mm',$pagetype='P')
 		*/
 
 		// For TCPDF, we specify permission we want to block
-		$pdfrights = (! empty($conf->global->PDF_SECURITY_ENCRYPTION_RIGHTS)?$conf->global->PDF_SECURITY_ENCRYPTION_RIGHTS:array('modify','copy'));
+		$pdfrights = (! empty($conf->global->PDF_SECURITY_ENCRYPTION_RIGHTS)?json_decode($conf->global->PDF_SECURITY_ENCRYPTION_RIGHTS, true):array('modify','copy')); // Json format in llx_const
 
 		// For encryption strength: 0 = RC4 40 bit; 1 = RC4 128 bit; 2 = AES 128 bit; 3 = AES 256 bit
 		$encstrength = (! empty($conf->global->PDF_SECURITY_ENCRYPTION_STRENGTH)?$conf->global->PDF_SECURITY_ENCRYPTION_STRENGTH:0);
 
 		// Array of recipients containing public-key certificates ('c') and permissions ('p').
 		// For example: array(array('c' => 'file://../examples/data/cert/tcpdf.crt', 'p' => array('print')))
-		$pubkeys = (! empty($conf->global->PDF_SECURITY_ENCRYPTION_PUBKEYS)?$conf->global->PDF_SECURITY_ENCRYPTION_PUBKEYS:null);
+		$pubkeys = (! empty($conf->global->PDF_SECURITY_ENCRYPTION_PUBKEYS)?json_decode($conf->global->PDF_SECURITY_ENCRYPTION_PUBKEYS, true):null); // Json format in llx_const
 
 		$pdfuserpass = ''; // Password for the end user
 		$pdfownerpass = NULL; // Password of the owner, created randomly if not defined