The file apalike.sty is an internationalized version of the docstrip
result of
  CTAN:biblio/bibtex/contrib/apalike.doc

So, this gives copyright to
  16-Sep-86, original version by Susan King and Oren Patashnik

The file doc/bibtex/base/README gives all bibtex files by Oren a free
software license, so I think that apalike.sty is free software.

Dec. 2004, Thomas Esser