document setting prevent placing a signature using Adobe Reader

Created a statis pdf witha  digital signature field in Adobe Livecycle designer, also tried in Acrobat PRO, saved as a PDF, when opening the file under Adobe Reader X or Adobe Reader 8 get sam eissue adobe reader will not allow the signature or document ot be changed, get a warning that saya "document setting prevent placing a signature using Adobe Reader"

Sorry I am new to Adobe, what does Reader want, I do not have this issue when I open the file under Acrobat PRO or Livecycle.

Thanks