If you wish to DRM-protect your own personal content for distribution-disabled delivery to peers--such as within a classroom or sensitive work setting--you must know Kindle PID numbers for those devices that you wish to be able to open your documents. This tool is intended to enable secure distribution of your own content ONLY and does NOT provide you with any tools to remove the DRM you apply. By using this tool you accept all responsibilities of doing so, and recognize that this software comes without any warranty of any kind, whatsoever.