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