body: Micrsoft's '.docx' file format is closed source. There are many softwares that convert '.docx' file to any other (ex. pdf,rtf,odt,txt) . These software developers must have to reverse engineer '.docx' file format in order to study it and be able to convert it to another. So is it legal to reverse engineer these kind of proprietary file formats?
  
  
  
title: Is it illegal to reverse engineer .docx file format?