copyleft pictures

[michele.catanzaro@tin.it]

ENGLISH

Hallo,

do you know where I can find some "copyleft" pictures
of complex networks? (pictures that represent Internet, Foodwebs,
Collaboration Networks...)

I need them to be published without paying
copyright.

Many thanks,

Michele

SPANISH

Hola,

sabeis donde puedo
encontrar una figuras de redes complejas "en copyleft"? (Internet,
Foodwebs, Colaboraciones profesionales...)

Las necesito para
publicarlas sin tener que pagar los derechos de autor.

Muchas gracias!

Michele