NOTE 4—Identifiable Intangible Assets

Identifiable intangible assets consist primarily of trademarks, copyrights and patents, purchased technologies, customer and reseller relationships and covenants not to compete which are amortized over the estimated useful life, generally on a straight-line basis with the exception of customer and reseller relationships which are generally amortized over the greater of straight-line or the related asset’s pattern of economic benefit. Useful lives range from three to ten years. As of May 31, 2014 and February 28, 2014, trademarks with an indefinite estimated useful life totaled $10.2 million and $9.6 million, respectively.

The following is a summary of identifiable intangible assets (in thousands):


	As of May 31, 2014							As of February 28, 2014
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Trademarks, copyrights and patents	$	107,849	$	(36,692	)	$	71,157	$	105,269	$	(34,784	)	$	70,485
Purchased technologies		80,906		(58,310	)		22,596		79,433		(55,960	)		23,473
Customer and reseller relationships		96,987		(64,848	)		32,139		89,992		(63,075	)		26,917
Covenants not to compete		14,469		(6,501	)		7,968		10,690		(5,977	)		4,713
Other intangible assets		8,920		(1,454	)		7,466		8,922		(1,111	)		7,811

Total identifiable intangible assets	$	309,131	$	(167,805	)	$	141,326	$	294,306	$	(160,907	)	$	133,399

Amortization expense associated with identifiable intangible assets recognized in the Company’s Consolidated Financial Statements for the three months ended May 31, 2014 and May 31, 2013 is summarized as follows (in thousands):


	Three Months Ended
	May 31, 2014		May 31, 2013
Cost of revenue	$	2,960	$	2,672
Sales and marketing		1,583		1,958
Research and development		956		959
General and administrative		1,429		1,537

Total amortization expense	$	6,928	$	7,126