La bolsa de semillas que se vende en el mercado negro, de forma ilegal, es la que se llama brown bag seed. Muchas veces se vende sin logo y no ha pasado los controles de calidad
Mira en
http://www.gene.ch/genet/1999/Oct/msg00008.html
The brush with the law arises when farmers sell their retained
seed on the black market for a healthy profit instead of using it
to sow their own property. The illegal item is dubbed the "brown
bag." "The seed has no guarantee of quality and identity, there
is tax evasion involved, and royalties aren't paid on the
purchaser rights of the seed variety owners,"