For licenses purchased after November 2nd, 2015 customers no longer receive a license key to activate the software.
JetBrains Account credentials or a License Server are two preferred activation methods for your software.
However, you are also provided with an offline activation code in case you need to use software with no Internet connection available. You can retrieve the offline activation code in the license management section of your JetBrains Account, for the license that is assigned to you.
Existing licenses purchased prior to November 2nd, 2015 will continue to work with license keys.