I am using adobe livecycle es2 version 8.2
Is the form password protected?
I am facing same issue. When I try to extract data from a password protected PDF, then I am getting an error: "Security Manager for decryption not set". Please help.
I think you answered your own question - the PDF is password protected therefore LC can't open it to extract the data.
You'll have to remove the security first. You can do that in a process by using the Common.EncryptionService.Remove PDF Password Encryption operation.
Note that you will need the document's password to remove the security.