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Intangible assets, net | 12 Months Ended
--- | ---
Mar. 31, 2017
Intangible assets, net |
Intangible assets, net | 15. Intangible assets, net
|  | As of March 31, |
|  | 2016 |  | 2017 |
|  | (in millions of RMB) |
Non-compete agreements |  |  | 4,284 |  |  | 5,915 |
Developed technology and patents |  |  | 3,652 |  |  | 4,793 |
Trade names, trademarks and domain names |  |  | 2,222 |  |  | 8,100 |
User base and customer relationships |  |  | 1,234 |  |  | 4,169 |
Licensed copyrights of video content |  |  | 787 |  |  | 6,087 |
Others |  |  | — |  |  | 32 |
Less: accumulated amortization and impairment |  |  | (6,809 | ) |  | (14,988 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net book value |  |  | 5,370 |  |  | 14,108 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization expenses recognized for the years ended March 31, 2015, 2016 and 2017 amounted to RMB2,173 million, RMB3,278 million and RMB9,008 million, respectively. The estimated aggregate amortization expenses for each of the five succeeding fiscal years and thereafter are as follows:
|  | Amounts |
|  | (in millions of RMB) |
For the year ending March 31, |  |  |  |
2018 |  |  | 6,129 |
2019 |  |  | 2,880 |
2020 |  |  | 906 |
2021 |  |  | 429 |
2022 |  |  | 417 |
Thereafter |  |  | 3,347 |
​ | ​ | ​ | ​ | ​
|  |  | 14,108 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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