The reason, they said, was to protect the national industry from foreign competition.
A big mistake, in a long run you only make it lazy, under invested and outdated.
At that time a Boss pedal was a luxury that only few could afford, acquired by travelling abroad or smuggled.
To fill the void in the Brazilian pedal market, Oliver (a Brazilian company) made a deal with Boss/Roland to license some Boss circuits to be produced inside Brazil.
With few components being substituted for similar made in Brazil ( ICs, transistors, etc.), Oliver managed to build a line with 10 models.
In these pictures, one can spot some similarities, like graphics printed in the manual, lettering, models name (with the addition of a zero), knobs, etc.
And look, they are all black label!




