Debian /etc/apt/sources.list

Hi

I use the command apt-get to keep my system up to date. The list of repositories I use to get updated

packages is kept in /etc/apt/sources.list. I already have a particular package installed which I do not want
to update.

How do I get apt-get to ignore updating this package when it is invoked on the command line?
Is it possible to put the package name in the sources.list file etc. This would be really useful so that if someone
else is managing the system they do not have to be aware that this package should be ignored.

Thanks in Advance

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