how do secure a pdf document, ie keep it from being altered or converted?

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how secure pdf document, ie keep being altered or converted? want convert word doc secure pdf can circulated, not want able altered or converted editable doc ... . . .

exportpdf web service convert pdf other formats. can't change pdfs or set security.

 

acrobat can set security (file > properties) sure read warning third party software get.

 

nothing can protect pdf if valuable enough. after all, if document has value in itself, can retype changes needed...



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