This document enabled extended features in Adobe Reader
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Tadelsucht commented
The message "This document enabled extended features in Adobe Reader. The document has been changed since it was created and use of extended features is no longer available. Please contact the author for the original version of this document." will be shown, if the read only option is used on a XFA pdf file.
https://web.archive.org/web/20110115051249/http://support.itextpdf.com/node/6