Digital signature Filter / SubFilter
Hi, i have a question regarding the use of digital signatures.As a filter value i am usingPDF32000.bookAdobe.PPKLite but i am not quite sure about the SubFilter. As i understand there are three...
View ArticleDealing with Predictors when decoding PDFs
I've seen a lot of questions about how to "unpredict" Xref streams. The answer usually goes something like "RTFM!" Well, I have R'd the FM, and it's still complicated. So, to save others the pain I've...
View Articlereuse embedded objects like images in pdf
Hello! I was just wondering, if there is a way of reusing embedded objects inside a PDF (like images.)?So let's say, I have a graphic on the first page and I want to use the same graphic on the third...
View ArticleR = 6? Standard Encryption Dictionary; AES-256; Acrobat X Pro
Hello Everyone, I've noticed something odd when using Acrobat X Pro to output an AES-256 encrypted PDF file for "Acrobat X and higher". The standard encryption dictionary has R as 6 (see below). 77 0...
View Article"To view the full contents of this document..."
Hi All, I am working on a PDF parser and while parsing PDF file I am able to parse the document catalog & cross reference table but when it comes to content I get a message "To view the full...
View ArticleFont type Identity-H not recognized
Hello guys, I have question and challenge with Font type identity-H. Actually i am tryping to convert PDF file to TIF using 3rd party tool called Ghostscript v.9. When pdf input stream comes in as a...
View ArticleAnnotation field locked and subsequent digital signatures
Hi all, i'm testing my PAdES digital signature library in Obj-C and i encountered this kind of PDF file http://dl.dropbox.com/u/3995257/PDF/Locked.pdf Acrobat Reader tells that the document is locked...
View ArticlePlease, help with Incremental Update for Linearized document.
Hi, here is my problem.I'm working in my own annotation app. It incrementally updates pdfs. Works fine with most of the pdfs.But i've found couple of pdfs, that was being corrupted after updating. Here...
View ArticleHow to Manage Text In PDF
Hi everyone. I am pretty new to PDF programming world and for study PDF ,I am prefering PDF specification.I can manage Printing text on my page but when my text length goes out to the page range it get...
View ArticleAdding XRef table to PDF w/ XRef streams?
I'm trying to fill in interactive form annotations by appending the PDF with updated versions of the annotation objects. I'm following the example in the appendix of the PDF spec for adding/modifying...
View ArticleUsage Rights question
Hi, I'm working on a product which allows to generate PDF files. One of our customers has asked about enabling Usage Rights in Abode Reader for the generated documents. So I'm currently investigating...
View Articlesearchability & metadata extraction on password protected or compressed PDFs
Hello, I am currently putting together a new document management system at my company (using http://www.alfresco.com ) and part of the functionality will involve automatic metadata extraction from...
View ArticleBaseFont and FontName must be equals?
I have trouble with an PDF/A document and some readers we are using: - Acrobat (Reader) 9.X works fine- Acrobat (Reader) 6.X and our own inhouse reader have problems I tracked it down to the following...
View ArticleHow does PDF/VT relate to 'V'ariable data and 'T'ransactions
Could someone explain to me how PDF/VT 'supports' Variable and Transactionsl data ? I'm new to PDF/VT and I'd expected that it somehow made it easier to insert variable and transactional data, but I...
View ArticleAutomatically scaling/sizing a PDF file
I support a web-based application that includes a query tool which allows the user to generate a PDF file from the query results. The PDF file is generated in landscape orientation and contains several...
View ArticleAdd Written Signature to PDF
I want to add a written signature to an existing PDF document. I would prefer to use an Image XObject in an annotation, but unless I'm overlooking it, there doesn't appear to be a way to create an...
View ArticlePDF bit order
Does the PDF format support little endian (lsb-to-msb) order for image data?The image is bilevel G4 compressed. If this is supported, what PDF tag do I need to use to specify this? Thanks,-Don
View ArticleFill and stroke a rectangle
Hello.When I write the following text, adobe reader displays a red rectangle with a black border. 10 w100 100 200 150 re1 0 0 rg %red fill0 0 0 RG %black strokeB but when i use operators f and S...
View ArticleMeta data / Custom data
Hello,I have pdf files with link annotations. For these link annotations I want to develop a plugin, that 'evaluates' some information if the user click the annotations. But for 'evaluating', I need to...
View Articlehow to insert png to pdf?
I have readed the pdf reference 1.6,i want to insert png to pdf.i konw that the png consits of alpha and RGB,31 0 obj<</BitsPerComponent 8/ColorSpace/DeviceRGB/Filter/DCTDecode/Height 154/Length...
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