Hi gaochenglu1,
ASA-5515-CTRL-LIC=Cisco Protect+Control license PID, this link will help you understand the Protection+Control license:
http://www.cisco.com/c/en/us/td/docs/security/firesight/541/firepower-module-user-guide/asa-firepower-module-user-guide-v541/Licensing.html#98698
This license Matrix is very helpful as well:
https://supportforums.cisco.com/sites/default/files/firesight_firepower_license_matrix.pdf
Hope this info helps!!
Rate if helps you!!
-JP-
