Searching some debian mailing lists I came across:

"Re: Advice on packaging SAGE" - see 
http://lists.debian.org/debian-mentors/2007/06/threads.html

Specifically from http://lists.debian.org/debian-mentors/2007/06/msg00020.html
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  IIRC Singular has licensing restrictions (requires citing the
authors) so I
  don't think it can go in main.

I don't think that is part of the license. After the license there is
first a request to send in comments and bugs to a specific address,
then a request to register yourself as user, then this
request:

If you use Singular or parts thereof in a project and/or publish
results that were partly obtained using SINGULAR, we ask you to cite
SINGULAR and inform us thereof - see
`http://www.singular.uni-kl.de/how_to_cite.html', for information on
how to cite Singular.

I'm no native english speaker, and I think those who have written this
are neither. But this looks much like it is a request and no condition
on use (or copying/modifying).

There are licencse problems with the omalloc library included, but it
looks like its author already relicenced it, so it will most likely
be fixed in the next version.

Hochachtungsvoll,
        Bernhard R. Link
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This might actually explain why Singular isn't in Debian.

Cheers,

Michael
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