use Aspose\Cloud\Common\AsposeApp;
use Aspose\Cloud\Common\Product;
use Aspose\Cloud\Common\Utils;
use Aspose\Cloud\Words\Document;

/**** Section 1 ****/
Product::$baseProductUri = 'http://api.aspose.com/v1.1';
AsposeApp::$appSID = "xxxxxxxxxxxxxxxxxxxxxxxx";
AsposeApp::$appKey = "xxxxxxxxxxxxxxxxxxxxxxxx";
AsposeApp::$outPutLocation = getcwd() . "/output/";
/**** End Section 1 ****/

/**** Section 2 ****/
$fileName = "Test.docx";
$password = "123456";
$protectionType = "NoProtection";

$doc = new Document($fileName);
$result = $doc->unprotectDocument($password, $protectionType);
/**** End Section 2 ****/

http://www.aspose.com/blogs/aspose-products/aspose-for-cloud-apis/archive/2014/06/11/apply-or-amend-protection-and-unprotection-on-word-processing-documents-using-aspose-cloud-sdk-for-php.html

The following technical tip shows how php developers can unprotect their word documents in cloud using Aspose for Cloud SDK in php.

PHP Code to Unprotect Word Document Using Aspose for Cloud API

PHP