We have all encountered situations where obtaining a signature of an appointed authority/specific individual was the only item on the checklist for completing a transaction. Starting in Acrobat 8, this is a very easy task for collecting signatures in your ad-hoc workflows. Navigate to the Advanced menu item on the toolbar in Acrobat 8.0 and select the "Enable usage rights in reader" option. This option allows the recipient of the document to sign as long as they have Adobe Reader 8.0 or higher version.You will see the following dialog box confirming the usage rights. Notice that one of the usage rights granted is the ability to digitally sign the specific document for which the rights have been granted.
For large volumes of data collection on these documents or forms, there is a corresponding Adobe LiveCycle Reader Extensions ES product that must be licensed.