List of abbreviations for licenses

[Nikita Karetnikov]

Hi,

I'm trying to package 'util-linux'. It uses several licenses:

 - GPLv3+
 - GPLv2+
 - GPLv2
 - LGPLv2+
 - BSD with advertising
 - Public Domain

What are the common abbreviations for Public Domain and BSD with
advertising? Is there a list of abbreviations for licenses?

As far as I can tell, 'license' doesn't check the used values. So it's
possible to use an incorrect value (e.g. "foobar"). Should we add a
function to check this?

Nikita