If you are developing a PDF form connecting to any webservice or database, and you want users can use "PDF application" in Adobe Reader in that case, your users must use Adobe Acrobat (it is not free) or you must reader extend the PDF via Reader Extensions ES server (it is not free). Adobe Acrobat is not enought to extend the PDF. Adobe Acrobat can extend only classic some capabilities, like digital signature, commenting etc.




You must use Reader Extensions ES:




Shortly, if you want Adobe Reader connect to a database or web service, you must order the Reader Extensions ES.