The following is a summary of intangible assets, net:


	As of December 31, 2018
	Gross carrying value		Accumulated amortization			Net carrying value
	RMB in thousands
Licensed copyrights of content		1,997,175		(921,565	)		1,075,610
License rights of mobile games		18,098		(15,163	)		2,935
Intellectual property and others		412,202		(71,312	)		340,890

Total		2,427,475		(1,008,040	)		1,419,435


	As of December 31, 2019
	Gross carrying value		Accumulated amortization			Net carrying value
	RMB in thousands
Licensed copyrights of content		3,072,959		(1,736,608	)		1,336,351
License rights of mobile games		71,703		(35,863	)		35,840
Intellectual property and others		434,089		(148,947	)		285,142

Total		3,578,751		(1,921,418	)		1,657,333


	As of December 31, 2020
	Gross carrying value		Accumulated amortization			Net carrying value
	RMB in thousands
Licensed copyrights of content		4,556,683		(2,891,742	)		1,664,941
License rights of mobile games		299,786		(119,493	)		180,293
Intellectual property and others		753,282		(241,557	)		511,725

Total		5,609,751		(3,252,792	)		2,356,959

Amortization expenses were RMB542.7 million, RMB905.6 million, and RMB1,395.1 million for the years ended December 31, 2018, 2019 and 2020, respectively.

The Group had performed impairment assessment of intangible assets and considered the relevant events and circumstances that might indicate potential impairment and concluded that there was no impairment indicator

No impairment charge was recognized for any of the periods presented.

As of December 31, 2020, the licensed copyrights of content have weighted-average useful lives of 3.7 years. The intangible assets amortization expense for future years is expected to be as follows:


	Intangible assets amortization expense
	RMB in thousands
2021		843,542
2022		575,491
2023		340,301
2024		205,238
2025		134,128
Thereafter		258,259

Total expected amortization expense		2,356,959