adobe systems incorporated notes to consolidated financial statements ( continued ) we review our goodwill for impairment annually , or more frequently , if facts and circumstances warrant a review .
we amortize intangible assets with finite lives over their estimated useful lives and review them for impairment whenever an impairment indicator exists .
our intangible assets are amortized over their estimated useful lives of 1 to 14 years .
amortization is based on the pattern in which the economic benefits of the intangible asset will be consumed or on a straight-line basis when the consumption pattern is not apparent .
the weighted average useful lives of our intangible assets were as follows : weighted average useful life ( years ) .
Weighted average useful life table: purchased technology | 6