I have a PDF file, and I'd like to comment in adobe style. Is there a way to enable that somehow, or are there any alternatives?
There is a feature to add annotations using the default gnome evince, but the tool doesn't have the feature switched on in Ubuntu 10.10, so you have a choice between:
pdfedit - Dedicated tool for editing pdf files.
flpsed - Useful, but not as polished.
inkscape - Importing the pdf, adding your visible notes and exporting back to pdf, downside is, they're not real pdf notes.
It might be a licensing issue.
Even thought the PDF has no security, commenting is still NOT allowed. Might be a licensing issue since the original was created using open source tools, not Acrobat.
"PDF Producer: Apache FOP Version 1.1" -- Commenting Not Allowed.
"PDF Producer: Adobe LiveCycle Designer ES 10.0" -- Commenting Works.
Platform: Linux Mint with Adobe Reader 9.
okular is the default KDE editor (though using it with Unity/Gnome is not a problem), is very polished and provides the requested functionality. After opening your PDF, enable "Review" in the "Tools" menu and a toolbar will appear with buttons for notes, highlighting, etc.
Foxit Reader allows pretty advanced commenting.
For text comments I suggest to use PDF Annotator (available in Ubuntu software center) - very easy application which allows saving in PS or PDF formats.
Not a desktop app, but Adobe has released Acrobat.com, which is essentially an online office suite, but it can read and make pdfs (a limit of 5 made per month for free, I think). I would assume that they have commenting as part of the suite and it would be acrobat style.
You can Comment, Highlight, Underline, Draw.......
Install by typing
$sudo apt-get install xournal
If you can wait for a while the new Acrobate X you can comment your document. I tried in windows and work's perfect.