CODEWITHSUNDEEP
javapdfpdf-generation
naveed
naveed

Reputation: 75

How to avoid from invalidating the signature after adding the content on PDF?

Trying to add content on signed PDF, but after adding the content the signatures get invalid.

Upvotes: 0

Views: 901

Answers (1)

Bruno Lowagie
Bruno Lowagie

Reputation: 77606

Please read http://itextpdf.com/book/digitalsignatures

As explained in the comments by mkl, the changes you can make depend on the MDP settings of the previous signature(s). Adding extra content to a content stream is explicitly forbidden, but in some cases you can add:

  • form fields
  • annotations
  • extra signatures

This is all explained in the book mentioned above (I wrote it, you can download it for free).

Upvotes: 1

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