I am using the PdfFileEditor class to concatenate two PDF documents (both PDF files originally made in Aspose.Words converted to PDF using Aspose.PDF)
The PDF file only contains the text 'hello world' and does not contain any forms. However when combined acrobat reader states 'Please fill out the following form. You cannot save data typed into this form."
Your demo appears to have the same problem (i am using acrobat reader 8)