Multi-line footer for single page

I need to add a copyright notice to my paper, and do not want it to break the layout, so I want to place it into the footer/header area of the initial page. Text may be multi-line. It should be displayed on the first page only.

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The following works for me.

\usepackage{fancyhdr}
\fancypagestyle{plain}{
U.S.~Government and is not subject to copyright protection in the United States.
Approved for public release; distribution is unlimited.}
}

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Welcome to TeX.sx! A tip: If you indent lines by 4 spaces, they'll be marked as a code sample. You can also highlight the code and click the "code" button (with "{}" on it). Also, note that this suggestion hold for all pages defined as plain. –  Werner Feb 24 '12 at 17:59

I would use a different approach and use the eso-pic package to place something globally on the first page

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It was helpful, but I hacked a bit, and still there were warnings. What I've done: \AddToShipoutPicture*{\put(54pt, 54pt){\begin{minipage}{505pt} %multiline_text% \\ \\ \\ anchor \end{minipage}}}. The text turned out to be vertically centered s.t. its center corresponded to the bottom border of the page, so I added an invisible anchor. Also, there were warnings: "! A <box> was supposed to be here.", "! Missing number, treated as zero", "! Illegal unit of measure (pt inserted)." twice. Thanks, anyway. :) –  overrider Mar 18 '11 at 9:56