Re: hiding content

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

On Thu, Jul 24, 2008 at 9:43 PM, Peter Münster <pmlists@free.fr> wrote:
> On Thu, Jul 24 2008, Wolfgang Schuster wrote:
>
>> > Enabling people to view the pdf preview version (limited, containing
>> > excerpts) before acquiring the full version.
>>
>> In this case the solution offered in the thread are no solution for your,
>> it's too easy for the customers to make the hidden content visible.
>
> Shouldn't it be very easy with MKIV, to replace the content to hide with
> whatever you want?
> Examples:
> - the replacement are only the corresponding line-skips

this is easy if the text is a complete paragraph and no linebreaks
are involved but it's going to be complicated with headers, linebreaks,
tables, figures etc.

> - the replacement are random letters printed in white

% engine=luatex

\definestartstop
  [randomized]
  [before={\bgroup\setcharactercasing[5]},
   after=\egroup]

\starttext

\input knuth

\startrandomized
\input knuth
\stoprandomized

\input knuth

\stoptext

Regards,
Wolfgang
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