Zapata's Blood 

In the DVD's section, under The Battle of Mexico City, it claims that Zapata's Blood is a cover.  This doesn't seem very likely, since Rage was extremely supportive of the Zapatista movement, which the song is about, and I have yet to see another band who openly supports them.  If it is a cover, could somebody please tell me who wrote it?  (and if it isn't, somebody please change it and say it isn't a cover)