InDesign may fail to open a PDF if the PDF file is protected by a password, it is very large, or if it is damaged. Here's the fix.

PDF2ID converts PDF and Windows XPS files into fully editable InDesign files allowing PDF and XPS file content recovery and reuse within InDesign. PDF2ID is the de-facto PDF conversion plug-in for ...

PDF2ID and ID2Office are both InDesign plug-ins offering workflow automation. InDesign CC 2014, the latest release of the Creative Cloud edition of InDesign.