Change Password of PDF File

Change password of PDF file

Use PdfFileSecurity when you need to rotate credentials on an already secured PDF.

Steps

1. Create a PdfFileSecurity instance.
2. Bind the secured PDF with bindPdf.
3. Call the appropriate changePassword overload, depending on whether you also want to reset privileges and key size.
4. Save the updated file and close the security object.

Java examples

public static void changeUserAndOwnerPassword(Path inputFile, Path outputFile) {
    PdfFileSecurity fileSecurity = new PdfFileSecurity();
    fileSecurity.bindPdf(inputFile.toString());
    fileSecurity.changePassword("owner_password", "new_user_password", "new_owner_password");
    fileSecurity.save(outputFile.toString());
    fileSecurity.close();
}

public static void changePasswordAndResetSecurity(Path inputFile, Path outputFile) {
    PdfFileSecurity fileSecurity = new PdfFileSecurity();
    fileSecurity.bindPdf(inputFile.toString());
    DocumentPrivilege privilege = DocumentPrivilege.getForbidAll();
    privilege.setAllowPrint(true);
    fileSecurity.changePassword("owner_password", "new_user_password", "new_owner_password", privilege, KeySize.x128);
    fileSecurity.save(outputFile.toString());
    fileSecurity.close();
}

public static void tryChangePasswordWithoutException(Path inputFile, Path outputFile) {
    PdfFileSecurity fileSecurity = new PdfFileSecurity();
    fileSecurity.bindPdf(inputFile.toString());
    if (fileSecurity.tryChangePassword("owner_password", "new_user_password", "new_owner_password")) {
        fileSecurity.save(outputFile.toString());
    } else {
        System.out.println("Password change failed. Check owner password or document security.");
    }
    fileSecurity.close();
}