To enable the Commenting in Adobe Reader you can either use Acrobat or LiveCycle Reader Extentions.
But, in Acrobat (even in Acrobat X) you cannot enable those Usage Rights via batch. ![](/legacyfs/online/emoticons/sad.png)
This means you will have to do this for each file separately.
Attention: The commenting will only be enabled for static forms (PDF-forms), not for dynamic forms (XFA-forms)!
Possible the LiveCycle Reader Extentions can do that, but this product is very, very expensive and I don't have it. ![](/legacyfs/online/emoticons/sad.png)