Dj controller SDJ100A1 key code - One For All URC4110 Remote Control

If you have a legitimate program contact the manufacturer.
They may give you a free copy or require you to buy a new one.

An activation key is usually a combination of Numbers, it can also have letters in the numbers. It is equivalent to a password to allow entry or its use. In your case the DJ Music Player program requires to be purchased to receive an activation key.
Some programs require 2 Keys, and activation key and a registration key. A key is no different than entering the proper number into an automobile "keyless entry" system, in order to open the door.

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i have download dj music mixer 5.1 it is asking for activation key what is the activation key of it

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Any "professional" version of any software requires that you PURCHASE a _GENUINE_ copy of the software. When you purchase, you will get a license-key code.

Sorry, It is against Fixya's TOS for providing authorization codes for any product.

But there IS a free version of virtual DJ. Check out Virtualdj.com under the products menu.