when you say invalid do you mean it’s corrupted or e.g. you get a warning sign in Adobe Reader? Would you have a sample PDF?
When you sign a document and sign it again the first signature points to a different document revision as you have changed the documents content afterwards. So invalid in that context could mean that the warning you might be getting is only reflecting that fact. Would need to see the document to understand what’s going on. BR Maruan Am 16.10.2014 um 11:48 schrieb Vomlel Jan <[email protected]>: > Hi Maruan and others, > > I created signature and it seems OK. > But when I create second signature (loadNonSeq, addSignature, saveIncremental > again), the first signature becomes invalid. > I think that there can be problem, that first page is updated (signatur is > invisible), but I dont understand it enough. > > Jan > > -----Original Message----- > From: Maruan Sahyoun [mailto:[email protected]] > Sent: Monday, October 13, 2014 4:09 PM > To: [email protected] > Subject: Re: problem with pdf eof > > Hi Jan, > > there are sample in the examples package for various ways to sign a document > [1]. Signing a document needs incremental saving. > > OTOH choosing the right solution should not be made on the base if there is a > license fee or not. > > Maruan Sahyoun > > [1] > http://svn.apache.org/viewvc/pdfbox/trunk/examples/src/main/java/org/apache/pdfbox/examples/signature/ > > > Am 13.10.2014 um 16:02 schrieb Vomlel Jan <[email protected]>: > >> Hi Maruan (and others), >> >> I would like to use pdfbox and bouncycastle for managing pdf signatures. >> Parsing, validation, timestamping (PADES LTV) . >> We used itext for it, but it is under commercial licence. >> Parsing signatures seems to be working (thanks to your advice). So I will >> try to create timestamp. >> Is it possible with pdfbox? I found save method on PDDocument, but Iˇm >> afraid, that it can change bite representation of pdf, and signatures become >> invalid. Is it true? What is right way to create signature or timestamp with >> pdfbox? >> >> Jan >> >> >> -----Original Message----- >> From: Maruan Sahyoun [mailto:[email protected]] >> Sent: Friday, October 10, 2014 10:44 AM >> To: [email protected] >> Subject: Re: problem with pdf eof >> >> Hi Jan, >> >> choosing the right technology is very important so I do understand your >> concerns. I had to make such decision about using PDFBox in the past too. >> It can >> If you have specific issues I can answer I’m happy to try to do so. As a >> general statement PDFBox is used in production environments today (as an >> example we ourselves are using it for a banking customer to process account >> statements, an airline company to preprocess archiving documents and various >> other customers). >> >> PDFBox is continuously enhancing the parsing as we try to deal with real >> world PDF files which are not always inline with the the PDF specification. >> Currently the best approach is to use PDDocument.loadNonSeq (which parses >> documents according to the Xref information) and in case of an exception >> PDDocument.load (which parses sequentially). The Apache Tika project, which >> uses PDFBox for parsing PDF’s, is running the parsing and text extraction >> against 50k PDFs being made available via http://digitalcorpora.org >> >> What is the application you would like to be using PDFBox for? Text >> Extraction, image conversion …. - I might be able to give you more specific >> information for your use case. >> >> BR >> >> Maruan >> >> Am 10.10.2014 um 10:10 schrieb Vomlel Jan <[email protected]>: >> >>> Thank you Maruan, this function loads document. >>> >>> I have read https://pdfbox.apache.org/ideas.html "Replace/Enhance PDF >>> parsing". I think correct parsing is very important, and I have some >>> doubts, if I can use pdfbox in production. Can you say something to rest me >>> :-). >>> >>> Jan >>> >>> -----Original Message----- >>> From: Maruan Sahyoun [mailto:[email protected]] >>> Sent: Friday, October 10, 2014 9:25 AM >>> To: [email protected] >>> Subject: Re: problem with pdf eof >>> >>> Hi >>> >>> you can try PDDocument.loadNonSeq(InputStream is, null) >>> >>> BR >>> >>> Maruan >>> >>> Am 10.10.2014 um 09:09 schrieb Vomlel Jan <[email protected]>: >>> >>>> Hello, >>>> I use PDFBox 1.8.7 PDDocument.load(InputStream is) method to parse PDF >>>> document in attachement. >>>> Method return without exception, but document model is incomplete. >>>> >>>> Problem is in characters after EOF (ofset 22939): >>>> startxref >>>> 22449 >>>> %%EOF >>>> @ >>>> 16 0 obj >>>> << >>>> /Type /Catalog >>>> >>>> PDFBox create internal IOException and ignore it with comment: >>>> /* >>>> * PDF files may have random data after the EOF marker. >>>> Ignore errors if >>>> * last object processed is EOF. >>>> */ >>>> >>>> Is this PDF construction valid? >>>> Which parser in PDFBox is correct? I tried ConformingPDParser, but another >>>> error occured. >>>> >>>> Jan >>>> >>>> >>>> >>>> >>>> Tento e-mail ani žádný z připojených souborů nejsou přijetím návrhu na >>>> uzavření smlouvy, ledaže je to v nich výslovně uvedeno. Pokud tomu tak >>>> není, nelze je považovat za jednání, které by zakládalo jakékoliv nároky >>>> vůči společnosti AiP Safe. Tento e-mail je určen pouze uvedenému příjemci >>>> a dalším osobám, které jsou jmenovitě uvedeny jako příjemci, a jeho obsah, >>>> včetně obsahu všech připojených souborů, je důvěrný. Jestliže nejste >>>> oprávněný příjemce, zdržte se, prosím, jakékoliv formy zveřejnění, >>>> reprodukce, kopírování, distribuce nebo šíření jeho obsahu, včetně obsahu >>>> všech připojených souborů. Pokud jste obdržel tento e-mail omylem, oznamte >>>> to, prosím, neprodleně jeho odesilateli a e-mail, včetně všech připojených >>>> souborů, vymažte. Všechny e maily adresované, přijímané nebo posílané AiP >>>> Safe s.r.o. nebo zaměstnanci AiP Safe s.r.o. jsou považovány za zásadně >>>> pracovní e-maily. V souladu s tím odesilatel nebo příjemce těchto e mailů >>>> souhlasí, že mohou být čteny jinými zaměstnanci AiP Safe s.r.o., než je >>>> daný příjemce nebo odesilatel, proto aby byla zajištěna kontinuita >>>> pracovních aktivit a byla umožněna jejich kontrola.. >>> >> >
