php - Is there any way to make a pdf which cannot be converted to word? -

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we have system generating pdf files. can convert files using online pdf word converter. there option available in yii or php stop this?

to prevent pdf been converted word may:

  1. set password required view pdf - once password shared - can removed
  2. convert pdf images, convert these images pdf (using imagemagick, ghostscript) - recoverable using ocr.
  3. write code damages so-called cmap(/tounicode dictionary) inside generated pdf copied text not match text displayed viewer - still recoverable using ocr.
  4. use handwritten font text drawn image. these images saved jpeg , these jpeg files converted final pdf - not recoverable using ocr can recovered using hwr
  5. use vector drawing commands draw own letters line line, letters not recognized pdf readers text - still recoverable using human eye.
  6. finally, may skip generating pdfs instead print physical document, make hard cover , send physical post customers , suppose lazy enough not remove cover , scan document page page ocr software.

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