Hi all,
There is one concern if the file is created using LiveCycle Designer.
How to check, open PDF file with a barcode in Reader/Acrobat, File>Properties> General, under Description tab of "Document Properties" Windows, Check "Application:" and "PDF Producer:"
The form needs to be reader extended through LiveCycle Reader Extension Server for paper form Barcodes to work in Adobe Reader.
The Reader Extensions function in Acrobat Professional does not include enabling an interactive PDF form for the PaperFormsBarcode object.
The barcode turns grey in Reader because the form does not have the barcode right. On the other hand, any version of Acrobat provides barcode encoding. If you want to distribute a barcoded form to Reader users, you must use LiveCycle Reader Extensions to apply a barcode right.
Reference article for more details: http://help.adobe.com/en_US/livecycle/11.0/DesignerHelp/WS92d06802c76abadb-39e0256b129b8b00b71-7f76.2.html
-Tariq Dar