How to check whether document has been edited

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hi all,

 

when user tries print pdf document trying check whether there changes done document, if there changes need hide digital signature field in pdf. appreciated.

if pdf has been signed digital signature allows changes can detect them calling signaturegetmodifications() method against signature field in acrobat javascript. problem trying hide signature field modification in , of itself, security on file may not allow it.

 

prior being signed there no concept of 'history' in pdf file, no way detect modifications.



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