title_body: Sending data automatically to a server from a PDF document Is there any way to send directly data from a PDF document back to a server? 
  
  I would like to collect data from readers of an ebook, preferably more or less automatically (with their full consent of the reader). Most ebook reader do not allow to send data e.g. reading analytics back to the writer, however PDF Forms supposedly designed explicitly with the purpose to collect data. However, the exact details and limitations are not clear for me even after reading their website:
  
  
  Can I send any kind of data back to a server, or is there any restriction (e.g. only text that was typed some kind of From field)?
  Can I send data automatically, e.g. after once the reader set the permissions or every single time I have to wait till the reader pushes some "send" button?
upvoted_answer: Answer:
  the easiest way is to add URL-links in the PDF text, because is the unique widespread (standard) option to online interactivity, present in near all PDF-readers. Some variations: 1) a link to a complete online form webpage; 2) one link for each question/answer.
  
  Comment: why to use PDF? and about EPUB?. EPUB is HTML, so have standard support to HTML interactivity.