c# - Acrobat restriction -


i want add function manipulate pdf file such creating or editing annotation. searched web , found 1 forum indicated there acrobat-forms check if modified third party tools , if it's can't show pdf via adobe reader. forum posted on april in 2010. still same?

your forum correct. things changing on time particular restrictions in place not constant.

some features useful in pdf adobe define them "extended features". means enabled in acrobat reader if pdf created using acrobat pro.

this means adobe can continue provide free reader @ same time encourage people purchase acrobat pro since can used create type of document.

the way detected via digital signature inserted pdf. if signature not present or has been invalidated modifying document see message along these lines.

“this document enabled extended features in adobe reader. document has been changed since created , use of extended features no longer available. please contact author original version of document.”

in past key extended feature restricted way ability save changes forms , fields. of release of acrobat reader xi no longer case.

acrobat reader xi provides features save eforms out of box. provided using version of acrobat able fill in , save standard pdf forms. problem may have relates older versions of acrobat reader did not have feature.

there other extended features can made specific particular pdf created particular tool. no doubt these change on time market evolves..

in theory possible license adobe's digital certificate can create similar documents. (at abcpdf .net) attempted years ago without success. believe sap company ever have done this.

i think have classified definitive answer. if myself. ;-)


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