Andrea Vacondio created PDFBOX-1453:
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             Summary: NPE saving modified encrypted document
                 Key: PDFBOX-1453
                 URL: https://issues.apache.org/jira/browse/PDFBOX-1453
             Project: PDFBox
          Issue Type: Bug
          Components: Writing
    Affects Versions: 1.7.1
            Reporter: Andrea Vacondio


I posted this on the mailing list but got no answer. I'm describing here some 
behaviors that are triggering NPE when saving a modified pdf document.
What I'm trying to do is to open an encrypted document, modify it, save it back 
(I attached my test project). The three tests I made they all end up with a NPE 
but they work if I turn on setAllSecurityToBeRemoved (and I don't want security 
to be removed).

First test: 
1- input is a doc encrypted with owner pwd having the modify permission on. 
2- The document is loaded and decrypted using owner pwd. 
3- permissions.isOwnerPermission() is true which is correct 
4- permissions.canModify() is true which is correct 
5- modify the doc and save throws a NPE which is NOT correct

Second test 
1- input is a doc encrypted with owner pwd having the modify permission on. 
2- The document is loaded but not decrypted 
3- permissions.isOwnerPermission() is true, why? I didn't provide any owner pwd 
I should not have owner permissions. 
4- permissions.canModify() is true which is correct 
5- modify the doc and save throws a NPE which is NOT correct

Third test 
1- input is a doc encrypted with owner pwd having NO permission. 
2- The document is loaded and decrypted using owner pwd. 
3- permissions.isOwnerPermission() is true which is correct
 4- permissions.canModify() is true, why? I can modify the doc because I have 
owner permission but the Modify should be off.
 5- modify the doc and save throws a NPE which is NOT correct 

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