🚀 go-pugleaf

>Judging from your post, I may have misunderstood what 'rights' mean.

I think so. But read on.

>How then does one highlight text section in a pdf file ?

Using Acrobat Standard, or Acrobat Professional
OR using Acrobat Reader on a file with commenting rights.

>When I click 'Tools' -> 'Customise toolbar' and tick the 'comment and markup bar', it nonetheless never appears as toolbar
>Supposedly the toolbar is only available when "document rights are enabled".

Yes.

>This doesn't happen automatically (not even in the pdf files that I have created myself) and a brief look at the 1000+ files that I have on my harddrive, they similarly say: Commenting : Not allowed.

This sounds correct. Did you any time enable commenting? This feature
is available on the Comments menu in Acrobat 7 Professional, and is
also in Acrobat 8 Professional.

>When then, is this highly adversed new feature then usable ?

I think, because you aren't using it.

Aandi Inston