title: Is there any digital wartermark technology for raw text?
body: <p>I have a demand to protect my data which can accessed by my client privately.
  My data is not in any document but in <a href="https://en.wikipedia.org/wiki/Plain_text" rel="nofollow">plain text</a>, e.g., a JSON string.
  I want to protect my data against being modified, then redistributing without my permission.</p>
  
  <p>I researched online for a while, and concluded that,</p>
  
  <ul>
  <li>there are digital watermark methods for protecting images, audio, videos or documents (pdf, MS Word doc or other format),</li>
  <li>but there is no methods for raw text.</li>
  </ul>
  
  <p>Is my conclusion correct? If so, why is it not possible to develop a watermark for raw text? If not, can you give me a hint to implement a watermark for raw text?</p>
  
  <p>Sorry for my poor English. I will appreciate for you answer and editing.</p>