I'm not sure that I know enough about PDF encryption and how PDFBox
decrypts files to be of much more help here. A NullPointerException
should be easy to track down though. About the only workaround I can
think of would be to open & remove all encryption, save, open unencrypted
file and do what you need to do. Of course, this would be a performance
hit, but it's a quick & dirty solution which might be good enough to get
you by for now. I've never wanted to open an encrypted PDF and then save
it without stripping out the encryption, so I don't know much about saving
encrypted PDFs. Trace through the SecurityHandler classes, and hit the
PDF reference from Adobe. That's your best bet.
Good luck,
Adam
"Hesham G." <heshamgne...@gmail.com>
10/31/2009 02:40
Please respond to
pdfbox-users@incubator.apache.org
To
<pdfbox-users@incubator.apache.org>
cc
Subject
Re: PDF Permissions
Hi ,
Thanks for your help Adam.
Today I have tried to change the permissions of my PDF, and your code
worked
fine ... I access the PDF using 'Owner Password'.
My problem is I want to write to the encrypted PDF ... This works fine,
until the line of saving the PDF, I get this Exception :
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at
org.apache.pdfbox.pdmodel.encryption.StandardSecurityHandler.prepareDocumentForEncryption(StandardSecurityHandler.java:261)
at
org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1002)
This exception just appears even if I don't write anything in the PDF ...
Just when I try to save it, ex :
pdfFile = PDDocument.load( file ); // Open this pdf to edit.// Decrypt
the pdf if it's encrypted :
if( pdfFile.isEncrypted() ) { StandardDecryptionMaterial dm
= new StandardDecryptionMaterial( "1234" );
pdfFile.openProtection( dm );
}
pdfFile.save( file ); // Exception here.
pdfFile.close();
Best regards ,
Hesham
--------------------------------------------------
From: <a...@swmc.com>
Sent: Friday, October 30, 2009 5:53 PM
To: <pdfbox-users@incubator.apache.org>
Cc: <pdfbox-users@incubator.apache.org>
Subject: Re: PDF Permissions
> Here are the basics:
> PDDocument doc = null;
> try {
> doc = PDDocument.load(someFile);
> StandardDecryptionMaterial sdm = new
> StandardDecryptionMaterial("yourPasswordGoesHere");
> doc.openProtection(sdm);
> // use the document like normal
> } catch(...) {
> // decryption error
> } finally {
> if(doc != null)
> doc.close();
> }
>
>
>
>
> "Hesham G." <heshamgne...@gmail.com>
> 10/30/2009 04:37
> Please respond to
> pdfbox-users@incubator.apache.org
>
>
> To
> <pdfbox-users@incubator.apache.org>
> cc
>
> Subject
> Re: PDF Permissions
>
>
>
>
>
>
> I am having problems with encrypted PDFs too. I don't know but I think
> there
> are things wrong with the Encryption / Decryption classes.
>
> Best regards ,
> Hesham
>
>
>
>
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