Help wanted: password protect a document

[vivien siu]

Hi, I need help on how to add password to my PDF file.

Please guide me on what API I should use.

I have previously use iText but somehow I'm getting this error below, therefore I want to try an alternative method:

java.io.IOException: Rebuild failed: trailer not found.; Original message: xref subsection not found at file pointer 26036
at com.lowagie.text.pdf.PdfReader.readPdf(Unknown Source)
at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
at com.lowagie.text.pdf.PdfReader.<init>(Unknown Source)
at ProtectPdf.setPassword(ProtectPdf.java:42)
at ProtectPdf.main(ProtectPdf.java:28)

Thank you very much! Please point me to alternate methods or enlighten me about the exception above, thanks again!

[Ulf Dittmer]

The iText tutorial has a couple of examples about encryption, and in general this works without problems.

Can you work with that file in other ways, e.g. add a watermark, so that it's clear that iText can handle the file in general?

[vivien siu]

Hi Ulf,
I tried it with other PDF files and they run fine.
The exception is caused by not adding "%%EOF" to the trailer, which I don't know how to do it.
anyway thanks, I switched to use SecurSign to encrypt my PDFs instead. Can you possibly take a look what is wrong with my code in another thread?

Signing PDF with SecurSign