[cairo] Re: pdf encryption, read-write permissions

chris nuernberger cnuernber at gmail.com
Tue Aug 23 10:57:33 PDT 2005

I apologize for the unclear message; you can set read-write flags in the PDF 
itself indicating whether other adobe products are supposed to be able to 
change the document (or read it in the first place I guess). To my 
understanding these are part of the pdf specification itself. More like file 
permissions than functionally being able to parse a pdf file (which I 
understand other people are working on).


On 8/23/05, William Lahti <xfurious at gmail.com> wrote:
> I can't speak on whether it's the right time to change the PDF backend API 
> because the release API is frozen for 1.0 but it does look like such API 
> changes would be necessary to support it. It may work well to just add a few 
> more pdf surface functions: cairo_pdf_surface_create_encrypted or such. 
> The other concern, which I think is seperate (maybe a typo), is to perform 
> what kind of read/write operations to PDFs? Cairo already supports 
> read/write access to the PDF output streams with 
> cairo_pdf_surface_create_for_stream. You may have to make a few wrapper 
> functions to wrap freads/fwrites (the API was abstracted to support other 
> kinds of streams).
> Perhaps you should elaborate your second topic unless I misunderstand. 
> Which I probably do :)
> On 8/23/05, chris nuernberger <cnuernber at gmail.com > wrote:
> > 
> > I would love to use cairo as a rendering backend for a tool that I am
> > writing, but we need a few PDF options and I don't know if they are in
> > cairo already or what. I searched the archives a bit but must have
> > missed the response I am looking for. 
> > 
> > Specifically, I need to know if cairo supports, plans on supporting,
> > or how difficult it would be to add pdf encryption (I know it is
> > pathetic but it is a business requirement), as pdf read-write
> > permissions. 
> > 
> > I *really* want to use cairo as I can see it is super powerful, but I
> > need these types of options. Please don't just tell me they don't
> > exist, give me a couple paths (I code, so I could add them myself if
> > necessary) to get them if they don't exist.
> > 
> > Chris
> > _______________________________________________
> > cairo mailing list
> > cairo at cairographics.org 
> > http://cairographics.org/cgi-bin/mailman/listinfo/cairo 
> > 
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