I downloaded the [2012 IRS 1040][1] form to my Mac to `~Downloads/f1040.pdf`, running OS X 10.7.5. Upon opening the pdf file in Preview (`Version 5.5.3 (719.31)`), I see fillable form data

![1040 form filled out][2]

I proceed to fill in more data, and eventually File -> Save a Version

![attempting to save][3]

Next I close the file, only to re-open it later and find all my entered data is missing. The [IRS claims][4] these forms are fill-in enabled:

> Beginning October 25, 2004, new fill-in forms were enabled with
> "document rights" which will allow you to save what you have filled in
> on your PC. Version 8.16 or later of Adobe Reader is required.

And inspecting the security of the PDF confirms this

![security][5]

Though, they also say Acrobat Reader is required. **My question is**: what am I doing wrong? I expected saving a version to retain the filled in form information. A possible workaround would be File -> Export every time I want to save something, but this seems counterintuitive.


  [1]: http://www.irs.gov/pub/irs-pdf/f1040.pdf
  [2]: https://i.sstatic.net/bDFG0.png
  [3]: https://i.sstatic.net/RRKwr.png
  [4]: http://www.irs.gov/uac/Fill-in-Forms-Information
  [5]: https://i.sstatic.net/uoA2Q.png