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I have created a simple Acroform with less than 10 textboxes and a signature field. When I insert data into the fields (not the signature field) and save the file, Adobe Acrobat 8.0 opens the file just fine and allows me to sign the document, but Adobe Reader 8.0 gives me the following message:

"This document contained certain rights to enable special features in Adobe Reader. The document has been changed since it was created and these rights are no longer valid. Please contact the author for the original version of this document."

I have no javascript, no FormCalc script on the page at all. I am filling the form out in a C# application, and have to save the file in another location once I have finished filling out the forms. Is there any properties that can be set before I save the original PDF so that the user can sign the saved PDF?