How to read PDFs created with an unknown random owner password?
PdfReader
has an undocumented static boolean
variable named unethicalreading
. For obvious reasons, this variable is set to false
by default. You could set this variable to true like this:
PdfReader.unethicalreading = true;
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.
![Bond - Java Bond](https://i.stack.imgur.com/vTNpS.jpg?s=256&g=1)
Comments
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Bond - Java Bond about 2 years
Requirement is to process a batch of PDF's one at a time and on success encrypt each of them with an user password.
However, these PDF's were encrypted previously with randomly generated dynamic owner password (not know 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();
But this code throws an
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.
P.S.: Solution isn't limited to iText, can use any other Java library (Free or licensed) too.
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Gerrit Griebel about 5 yearsCheck out this alternative workaround stackoverflow.com/a/36176562/3227457 if you're stuck with iText 2.1.7 for licensing reasons