All the new Microsoft Office file formats that were introduced with Office 2007 are essentially XML-based. These new formats are distinctive with their X suffixes, so that PPT evolved as PPTX (similarly DOC as DOCX, and XLS as XLSX) — these new file formats continue being used in all subsequent versions of Office on both Windows and Mac. However, they are all essentially ZIP files. The ZIP file acts as a wrapper that contain plenty of XML files and other media content.
So how far would any WRM (Windows Rights Management) protection help? Won’t savvy users be able to unzip those files and get to the content, even without using any WRM credentials? We tested this scenario by adding a ZIP extension to a WRM protected PowerPoint PPTX file, and then tried to unzip the file.
However, the unzipped folder showed up as empty! Follow these steps to see how this process works:
It would now be renamed to:
Figure 1: Change the file extension?
Figure 2: An empty Zip file!
Figure 3: Just a ZIP, no unZIP!
This indicates that your WRM (Windows Rights Management) protected presentation is actually fully protected!
Microsoft and the Office logo are trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries.