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I use "Share Protected" to send an office file by RMS Sharing App in windows, but I find the message generated 2 attachments, why?

When you share protected an office file by email (share protected), the RMS sharing application automatically creates a .ppdf version alongside with a protected Word, Excel, PowerPoint file.  This is a read-only IRM protected PDF (.ppdf) file that allows only authorized people to read this .ppdf file, especially on mobile device, using RMS Sharing App where office application may not be readily available.