Copyleft license that allow inclusion in other program?

[S P Arif Sahari Wibowo]

Hi opensourcer!

Do you know whether there are any licenses that allow inclusion 
(more than just linking) of the code into other program with 
other license, but the license is still copyleft (albeit weak)?

Why inclusion instead of linking? Well, for scripts "library" or 
snippets which are distributed and run from source, there are 
issues with linking:
  - the term "linking" is not very meaningful (often done by the 
interpreter include the code into the caller code).
  - some scripts snippets do required to be included to be useful 
(e.g. some shell codes that need to be put into the startup 
scripts).

Actually I think scripts should be treated more like a 
documents. However, open source licenses I know for 
documentation - CC-BY-SA and GFDL - seems to be strong copyleft 
(inclusion in other document only valid if the whole final 
document in the same license), aren't they?

Why not permissive license such as BSD or X11 licenses? Well 
they are not exactly copyleft (does not guarantee changes for 
the source itself will be released as open source), right?

Any thought? Thanks!

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