exception "PdfReader not opened with owner password"

[VladimirAlexiev]

• open https://www.epri.com/research/programs/062333/results/3002026852
• download https://restservice.epri.com/publicdownload/000000003002026852/0/Product
• save 3002026852_Common Information Model Primer_ Ninth Edition.pdf
• start Briss2.0.bat and load this file
• it analyzes it correctly
• click "Crop"
• the file *_cropped.pdf is written with size 0
• the following appears in the console window:
• but the file is not password protected?

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: PdfReader not opened with owner password
        at com.itextpdf.text.pdf.PdfReaderInstance.getImportedPage(PdfReaderInstance.java:80)
        at com.itextpdf.text.pdf.PdfCopy.getImportedPageImpl(PdfCopy.java:388)
        at com.itextpdf.text.pdf.PdfCopy.getImportedPage(PdfCopy.java:255)
        at at.laborg.briss.utils.DocumentCropper.copyToMultiplePages(DocumentCropper.java:100)
        at at.laborg.briss.utils.DocumentCropper.crop(DocumentCropper.java:62)
        at at.laborg.briss.BrissSwingGUI.savePDF(BrissSwingGUI.java:370)
        at at.laborg.briss.BrissSwingGUI.lambda$showSaveFileDialog$9(BrissSwingGUI.java:335)
        at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
        at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
        at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
        at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
        at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
        at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
        at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
        at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
        at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
        at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
        at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Note: I thought the culprit are annotations added by SumatraPDF, but it also happens on the original file

Versions:

• briss 2.0 alpha5
• Windows 10,
• cygwin,
• openjdk version "22" 2024-03-19
  OpenJDK Runtime Environment Temurin-22+36 (build 22+36)
  OpenJDK 64-Bit Server VM Temurin-22+36 (build 22+36, mixed mode, sharing)

[cleydyr]

From Wikipedia:

The standard security provided by PDF consists of two different methods and two different passwords: a user password, which encrypts the file and prevents opening, and an owner password, which specifies operations that should be restricted even when the document is decrypted, which can include modifying, printing, or copying text and graphics out of the document, or adding or modifying text notes and AcroForm fields. The user password encrypts the file, while the owner password does not, instead relying on client software to respect these restrictions. An owner password can easily be removed by software, including some free online services.[33] Thus, the use restrictions that a document author places on a PDF document are not secure, and cannot be assured once the file is distributed; this warning is displayed when applying such restrictions using Adobe Acrobat software to create or edit PDF files.

So, even though the file doesn't have a user password (which we currently cover) it does have an owner password. The library we use allows the use of the unethicalReading flag to ignore owner permissions. But that name has been effective in making me think twice before adding it to our code as a workaround.

Thoughts, @mbaeuerle?

[VladimirAlexiev]

Imho cropping cannot be considered unethical