Requirement is to process a batch of PDFs one at a time and on success encrypt each of them with an user password. However, these PDFs were encrypted previously with randomly generated dynamic owner password (not known to any one) to prevent any edits.
I use iText for encryption as shown below:
byte userPass = "user".getBytes(); byte ownerPass = "owner".getBytes(); PdfReader reader = new PdfReader("Misc.pdf"); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("Processed_Encrypted.pdf")); stamper.setEncryption(userPass, ownerPass, PdfWriter.ALLOW_PRINTING, PdfWriter.ENCRYPTION_AES_128 | PdfWriter.DO_NOT_ENCRYPT_METADATA); stamper.close(); reader.close();
com.itextpdf.text.exceptions.BadPasswordException: PdfReader not opened with owner password
Can some one guide on how to resolve this error / bypass owner password?
Here I would like to make clear that we legally own these PDFs, so no crime / hacking is committed.
PdfReader has an undocumented
boolean variable named
unethicalReading. For obvious reasons, this variable is set to
false by default. You could set this variable to
true in iText 7 like this:
From now on,
PdfReader will ignore the presence of an owner password. It will only throw an exception if a user password is in place.
Use this at your own risk.
Click this link if you want to see how to answer this question in iText 5.