Rabarberski's 2012 question (Belgium):
I want to add a box with some copyright statement at the bottom of my paper. What is the easiest/best way to do this?
The question has a parenthetical remark about FancyHdr, which would place the copyright in the footer. The accepted answer assumes that he wants the copyright in the footer. As his question is phrased, then the expected answer might be what appears in published books. The images below are of the copyright pages for Conte-deBoor (McGraw-Hill 1980). The LaTeX sources produced the images. Many books place the copyright notice on the back side of the title page. Using the sources, the copyright notice can be moved to the desired location.
\documentclass{book}
\usepackage[b6paper]{geometry}
\begin{document}
\begin{titlepage}\begin{center}
\huge\bf ELEMENTARY NUMERICAL ANALYSIS \\[2ex]
\large\bf An Algorithmic Approach \\
\large\rm Third Edition\\[2ex]
S. D. Conte, Purdue University \\
Carl de Boor, University of Wisconsin-Madison
\clearpage\thispagestyle{empty}
~\vfill% empty text at top of page
\large\bf ELEMENTARY NUMERICAL ANALYSIS\\
\normalsize\rm An Algorithmic Approach\\
Copyright \copyright 1980 by McGraw-Hill, inc. All rights reserved.\\[1pc]
234567890 DODO 89876543210
\end{center}\end{titlepage}
\end{document}

An ANSWER to the parenthetical question about fancyhdr.sty modifies the code used for the first image. Only the fancyhdr package was added.
\documentclass{book}
\usepackage[b6paper]{geometry}
\usepackage{fancyhdr}\renewcommand{\headrulewidth}{0pt}
\begin{document}
\begin{titlepage}\begin{center}
\huge\bf ELEMENTARY NUMERICAL ANALYSIS \\[2ex]
\large\bf An Algorithmic Approach \\
\large\rm Third Edition\\[2ex]
S. D. Conte, Purdue University \\
Carl de Boor, University of Wisconsin-Madison
\clearpage\thispagestyle{fancy}
\fancyfoot[C]{\footnotesize\rm
Copyright \copyright 1980 by McGraw-Hill, inc. All rights reserved.}
~\vfill% empty text at top of page
\large\bf ELEMENTARY NUMERICAL ANALYSIS\\
\normalsize\rm An Algorithmic Approach\\
234567890 DODO 89876543210
\end{center}
\end{titlepage}
%\fancyfoot[C]{\relax}
\chapter{Introduction}
\end{document}
