JavaSecEx1.2fcs.zip examples are base on the 1.2 FCS (first customer ship) API. (UNIX users can use jar to unpack the zip file.) JavaSecEx.zip examples are based on the 1.2 Beta 3 API. javasec.tar.Z.old is the original archive of example files for _Java Security_, which contained some errors that were corrected in the JavaSecEx.tar.Z file.