Re: [iText-questions] Append existing signed PDF with content in such way signature stays valid. (generation next)

2009-11-02 Thread Leonard Rosenthol
Exactly! We even considered making them officially deprecated for ISO 32000-1...maybe I'll go do it now for part 2 (PDF 2.0)... Leonard -Original Message- Currently I hardly see a use for positive generation numbers. Adobe doesn't seem to, either, as they did not even consider them whe

Re: [iText-questions] Append existing signed PDF with content in such way signature stays valid. (generation next)

2009-11-02 Thread mkl
Tamas, Tamas wrote: > > *Originally I planned to implement full version history in only one pdf > and certify the (any kind of) modifications with signatures. > I will search a work around but please confirm that statement the > previously panned implementation (*) is impossible with itext (or

Re: [iText-questions] Append existing signed PDF with content in such way signature stays valid. (generation next)

2009-11-02 Thread Leonard Rosenthol
ONLY IF an object number if reused is the generation incremented. BUT there is nothing that says that when you replace an object you have to use the same number. So instead of replacing object "10 0 obj" with "10 1 obj", it is perfectly legal (and actually more common) to replace with some oth

Re: [iText-questions] Append existing signed PDF with content in such way signature stays valid. (generation next)

2009-11-02 Thread Tamas
Thank you for the reply Michael, it was very useful. So I think this is the point to me in the ISO32000 desc: Table 254 – Entries in the DocMDP transform parameters dictionary " P number (Optional) The access permissions granted for this document. Valid values shall be: 1No changes to the docume