How Important Is Acrobat 5?--McIlroy

Acrobat has supported PDF forms for the last several releases, but new features will greatly encourage their adoption: they have all of the database linking and interactivity of HTML forms, but also with the paper fidelity of PDF and its secure digital signature features.

Strong Security Features
PDF document security has been beefed-up further with the addition of 128 bit encryption and with "precision" security features that enable authors to vary the level of security for different groups of users.