grep -l -i copyright */*.c:

aisoshad/aisoshad.c
aisoshad/izebra.c
aisoshad/lineshad.c
docs/progman.c
filters/3ds2irit.c
filters/dat2bin.c
filters/dat2irit.c
filters/dxf2irit.c
filters/igs2irit.c
filters/irit2dxf.c
filters/irit2hgl.c
filters/irit2igs.c
filters/irit2iv.c
filters/irit2nff.c
filters/irit2off.c
filters/irit2plg.c
filters/irit2pov.c
filters/irit2ps.c
filters/irit2ray.c
filters/irit2scn.c
filters/irit2stl.c
filters/irit2wrl.c
filters/irit2xfg.c
filters/obj2irit.c
filters/off2irit.c
filters/stl2irit.c
grapdrvs/gen_grap.c
ihidden/ihidden.c
illustrt/illustrt.c
irit/irit.c
poly3d-h/poly3d-h.c
prsr_lib/iritvrml.c
