diff --git a/UsesCases/EncryptDecrypt/passwordModify.php b/UsesCases/EncryptDecrypt/passwordModify.php
new file mode 100644
index 0000000..90167c4
--- /dev/null
+++ b/UsesCases/EncryptDecrypt/passwordModify.php
@@ -0,0 +1,88 @@
+<?php
+
+require_once 'vendor/autoload.php';
+
+use Aspose\PDF\Configuration;
+use Aspose\PDF\Api\PdfApi;
+
+$credentials = json_decode(file_get_contents(__DIR__ . "/../../../Credentials/credentials.json"), true);
+
+$configParams = [
+    'LOCAL_FOLDER' => 'C:\\Samples\\',
+    'PDF_DOCUMENT_NAME' => 'sample.pdf',
+    'LOCAL_RESULT_DOCUMENT_NAME' => 'output_sample.pdf',
+    'DOCUMENT_PASSWORD' => 'Owner-Password',
+    'NEW_USER_PASSWORD' => 'NEW-User-Password',
+    'NEW_OWNER_PASSWORD' => 'NEW-Owner-Password',
+];
+
+class PdfEncoder {
+    private $pdfApi;
+    private $configParams;
+
+    private function _create_rest_api() {
+        $credentials = json_decode(file_get_contents("./Credentials/credentials.json"), true);
+
+        $configAuth = new Configuration();
+        $configAuth->setAppKey($credentials['key']);
+        $configAuth->setAppSid($credentials['id']);
+
+        $this->pdfApi = new PdfApi(null, $configAuth);
+     }
+
+    public function __construct($config) {
+        $this->configParams = $config;
+        $this->_create_rest_api();
+    }
+
+    public function uploadDocument() {
+        $filePath = $this->configParams['LOCAL_FOLDER'] . $this->configParams['PDF_DOCUMENT_NAME'];
+        $fileData = file_get_contents($filePath);
+
+        $this->pdfApi->uploadFile($this->configParams['PDF_DOCUMENT_NAME'], $fileData);
+        echo "File: '{$this->configParams['PDF_DOCUMENT_NAME']}' successfully uploaded.\n";
+    }
+
+    public function downloadResult() {
+        $result = $this->pdfApi->downloadFile($this->configParams['PDF_DOCUMENT_NAME']);
+        $outputPath = $this->configParams['LOCAL_FOLDER'] . $this->configParams['LOCAL_RESULT_DOCUMENT_NAME'];
+        file_put_contents($outputPath, $result['body']);
+        echo "Downloaded: {$outputPath}\n";
+    }
+
+    public function changePassword() {
+        $documentPassword = base64_encode($this->configParams['DOCUMENT_PASSWORD']);
+
+        $userPassword = base64_encode($this->configParams['NEW_USER_PASSWORD']);
+        $ownerPassword = base64_encode($this->configParams['NEW_OWNER_PASSWORD']);
+
+        $response = $this->pdfApi->postChangePasswordDocumentInStorage(
+            $this->configParams['PDF_DOCUMENT_NAME'],
+            $documentPassword,
+            $userPassword,
+            $ownerPassword
+        );
+
+        if ($response['body']['code'] == 200) {
+            echo "changePassword(): Password in document '{$this->configParams['PDF_DOCUMENT_NAME']}' successfully changed.\n";
+        } else {
+            throw new Exception("changePassword(): Failed to change password in document '{$this->configParams['PDF_DOCUMENT_NAME']}'. Response code: {$response['code']}");
+        }
+    }
+}
+
+function main() {
+    global $configParams;
+
+    $encoder = new PdfEncoder($configParams);
+
+    try {
+        $encoder->uploadDocument();
+        $encoder->changePassword();
+        $encoder->downloadResult();
+    } catch (Exception $e) {
+        echo "Error: " . $e->getMessage() . "\n";
+    }
+}
+
+main();
\ No newline at end of file