Copyright metadata into Adobe Reader using pdflatex

Question

Ok, first of all I'm quite aware there are a couple of question that address this issue. More in specific:

1. How to add copyright information to PDF metadata

2. Eliminate/Edit PDF properties added by pdfLaTeX

3. Is there a poisonous interaction between memoir, hyperref, and hyperxmp?

I tried using the hyperxmp package, as described this answer in question 1 , but I still didn't see the copyright property. All I got was a PTEX.Fullbanner with value This is MikTeX 2.9.4535(1.40.13).

Question 2 refers to many document properties, and although I have used them (more specifically, I'm using \usepackage[pdfusetitle]{hyperref}), I wasn't able to use the pdfcopyright property and the hyperxmp package with success (I just wasn't getting anything on the PDF properties, except for the same PTEX.Fullbanner with value This is MikTeX 2.9.4535(1.40.13)

I ran the code presented in question 3 and I still do not get any copyright info in Adobe Reader.

(Question 3 Code):

\documentclass{article}
\usepackage{lipsum}
\usepackage{hyperref}
\usepackage{hyperxmp}
\makeatletter
  \AtEndDocument{\hyxmp@find@metadata\hyxmp@embed@packet}
\makeatother
\hypersetup{
    pdfauthor={Brent Longborough},
    pdftitle={O Hai},
    pdfcopyright=Copyright © 2012 by Brent Longborough. All rights reserved.}
\begin{document}
\lipsum[1]
\end{document}

I have tried running pdfLaTeX, XeLaTeX and LuaLaTeX, but I still have this property empty in the PDF. I tried removing the \AtEndDocument{\hyxmp@find@metadata\hyxmp@embed@packet} and I still got nothing. Is there something I'm missing? Is this even possible with Adobe Reader?

Please note

I would like not to use any additional file than my .tex one. (That was the idea behind using the hyperxmp package

My specific code

\documentclass{report}
\usepackage{lipsum}
\usepackage[pdfusetitle]{hyperref}
\usepackage{hyperxmp}
\title{Titulo}
\author{Autor}
\hypersetup{
    pdfcopyright={\copyright Date by Aauthor.  All rights reserved.}%
}
\begin{document}
\lipsum[1]
\end{document}

Answer 1

Your example is working as expected, the problem is that Adobe Reader unfortunately doesn't support showing these XMP properties:

[N]ote that XMP display is not supported in Adobe Reader[.]

(as already pointed out by Robert). In Adobe Acrobat on the other hand, you have a button Additional metadata... in Document Properties→Description which reveals this dialog:

If you want to also have your copyright information visible in Adobe Reader, you can add a custom metadata field to the document information directory using the pdfinfo key (as demonstrated in How to add copyright information to PDF metadata):

\documentclass{report}
\usepackage{lipsum}
\usepackage[pdfusetitle]{hyperref}
\usepackage{hyperxmp}
\title{Titulo}
\author{Autor}
\hypersetup{
    pdfcopyright={\copyright Date by Aauthor.  All rights reserved.},
    pdfinfo={
        Copyright={\copyright Date by Aauthor.  All rights reserved.}
    }
}
\begin{document}
\lipsum[1]
\end{document}

Of course, this is a non-standard approach, but it has the advantage of working with Adobe Reader while still including XMP metadata which e. g. can be extracted automatically.