About the copyright of poppler-data

No, poppler-data is a PDF rendering library based on the xpdf-3.0 code base. It's not connected to adobe. It's released under GPL.
Here you can find the site of the project:
http://poppler.freedesktop.org/

Here is all about GPL license:
http://www.gnu.org/copyleft/gpl.html

well, thank you for your answer, I've got some answer here from the package itself:

I extracted the files in poppler-data_0.2.0-0ubuntu1_all.deb,

in /poppler-data_0.2.0-0ubuntu1_all/data/usr/share/doc/poppler-data, I got two files, one is README and the other is copyright,

in README it writes,

"poppler-data

This package consists of encoding files for use with poppler. The
encoding files are optional and poppler will automatically read them
if they are present. When installed, the encoding files enables
poppler to correctly render CJK and Cyrrilic properly. While poppler
is licensed under the GPL, these encoding files are copyright Adobe
and licensed much more strictly, and thus distributed separately.
"

in copyright it writes,

"The various data files installed by the poppler-data package carries
    this license:

    Copyright 1990-1998 Adobe Systems Incorporated.
    All Rights Reserved.

    Patents Pending

    NOTICE: All information contained herein is the property of Adobe
    Systems Incorporated.

    Permission is granted for redistribution of this file provided
    this copyright notice is maintained intact and that the contents
    of this file are not altered in any way from its original form.

    PostScript and Display PostScript are trademarks of Adobe Systems
    Incorporated which may be registered in certain jurisdictions.
"

Could anyone give me more information on whether poppler-data is totally GPLed?

Thanks.

I don't know, here you can read what we have read on the previous site:
http://en.wikipedia.org/wiki/Poppler_%28software%29
It's released under GPL. Probably the Adobe license is for the PDF file format.

Ok, I think that the poppler-data package might be distributed separately for some of it is copyrighted by Adobe and could not be altered.

well, I got this in new versions of poppler-data, poppler-data_0.4.4-1_all.deb:

"
Files: cMap/*, ai0/*
Copyright: 1990-2009, Adobe Systems Incorporated.
License: other
 Redistribution and use in source and binary forms, with or
 without modification, are permitted provided that the
 following conditions are met:

 Redistributions of source code must retain the above
 copyright notice, this list of conditions and the following
 disclaimer.

 Redistributions in binary form must reproduce the above
 copyright notice, this list of conditions and the following
 disclaimer in the documentation and/or other materials
 provided with the distribution.

So it has been GLPed.