PDF files are incredible as far as file formats go. They can be text documents, images and much more, and they are all cross-compatible over all available versions.
One of the leading developers of PDF-oriented products is Adobe, with its proprietary line of software tools known as Adobe Acrobat.
One of their most popular programs, Adobe Acrobat Reader, is the world’s most popular PDF reader, thanks to the simplicity and the richness in features that it brings.
However, users have been reporting that they have been having problems with Adobe Acrobat Reader when trying to open certain PDF files:
I have filled up a form using Foxit Reader. When I tried to open the form with Adobe Acrobat Reader DC I got error “The document enabled extended features in Adobe Acrobat Reader DC. 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” I tried some other PDF programs, no issue when opening this form.
Apparently, the problem itself was with how the user handled the PDF file in the first place.
How can I use all extended featured of Adobe Reader?
Use only Adobe products
It would seem that whenever you create a PDF file with an Adobe product, a digital signature is applied. Apparently, only other Adobe products are able to modify and re-save documents without breaching that digital signature.
In the case at hand, the user broke the seal by using another PDF editor (Foxit), and the PDF became unusable with all of its features once it was opened with an Adobe product again.
If all you are interested in is viewing or printing the document, then you can simply ignore the error message altogether. But if you want to edit or change security preferences, then you will need to fix the document first.
We don’t know if other developers use the same digital signature feature on PDF files. However, as far as Adobe products go, try using only their programs when creating, viewing or editing PDF documents.
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