not really what you asked for, but how about calculating CRC / hash of the downloaded stuff. Then you can at least state later if it was tampered with or not...
And you still can stream to DVD-Rom ;-)

>Hi
>
>I'm downloading a web page in c#
>
>HTML = wc.DownloadString(fullHTMLString);
>
>I would like to be able to save a copy of the webpage (or part of the page) in the string as a pdf.
>
>Any ideas on the best way to do this .
>
>The need is to have an non editable copy of the page to prove its state at the time of the download. so any ideas about how to achieve that.
>
>Thanks
>
>Nick