[NTG-context] ConTeXt tool for enabling comments in PDF ?

[h h extern]

Vit Zyka wrote:

> So, to do that, pdfTeX should start to calc document diggest and there 
> should be standard(?) process of signing this value.

how is that one calculated, imagine that in the %! fields you fill in 
placeholders like hereshouldgosomemagiccode, then one can run a script over the 
pdf, calculate that magic, and replace the string; maybe this can be hooked into 
  xpdflib

Hans

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