This excerpt taken from the PBR 6-K filed Jun 8, 2009.
2.11 Deferred assets
Provisional Measure 449/08 extinguished deferred assets, but permits maintaining the balance of December 31, 2008, which will continue to be amortized, over a period of up to 10 years, subject to impairment testing.
This excerpt taken from the PBR 6-K filed Mar 4, 2008.
3.8 Deferred assets
Recorded at purchase and formation cost, less amortization, which is calculated by the straight-line method at rates that consider the useful life of the intangible assets. Deferred assets are recorded only when there is an expectation of future realization based on the economic benefits related to those assets.