title_body: Is there a standard file format for distributing digital comic books? The standard for pirated comic books seems to be a .cbz/.cbr format, as well as a less frequent epub. .pdf is being a discouraged (some would say unforgivable) option but not unheard of in the pirate-web-o-sphere. 
  
  The question is, is there an industry standard used by official publishers for digital comic books?
upvoted_answer: First of all, the .CB* file format isn't a own file format at all, as it simply represents a standard archive file. That's also where the different endings come from:
  
  
  .cbr for Rar files
  .cbz for Zip files
  .cbt for Tar files
  .cb7 for 7z files
  
  
  and so on...
  
  Those are also the most widely used file formats for comics. But serveral publishers use PDF files along with their security features to sell comic books (as far as I observed, those PDFs are largely disliked by many comic fans)
  
  So to speak for reaching the audience, .cb* should be the best option currently available although it unfortunately isn't a standard fully applied by the industry.