[Translate to English:] Microsoft Officeファイルへのパスワード付与方法
Password Protecting and Encrypting Office 2013 documents including Word 2013, Excel 2013 and Powerpoint 2013 is a simple yet a very effective means of protecting sensitive data.
Password Protect and Encrypt Word 2013, Excel 2013 and Powerpoint 2013 documents
URL: www.groovypost.com/howto/password-protect-encrypt-office-2013-word-excel-powerpoint-documents/