you mentioned a particular code was stolen in this regard; what is meant by that code?
It is any collection of code, with or without comments, written using a "human-readable" programming language, usually as plain text
Source code
In computing, source code is any collection of code, with or without comments, written using a "human-readable" programming language, usually as plain text. 
what is the current version of symantec endpoint protection Version 12.1.2 what does it refers to? It  is a security software suite that consists of anti-malware, intrusion prevention and firewall features for server and desktop computers can you state any one feature of it? In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules is it itself vulnerable at any point? Yes,  source code for Symantec Endpoint Protection was stolen and published online when was it launched? The first release of Symantec Endpoint Protection was published in September 2007 who launched it? UNANSWERABLE
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Source code [SEP] Introduction
In computing, source code is any collection of code, with or without comments, written using a "human-readable" programming language, usually as plain text. The source code of a program is specially designed to facilitate the work of computer programmers, who specify the actions to be performed by a computer mostly by writing source code. The source code is often transformed by an assembler or compiler into binary machine code that can be executed by the computer. The machine code might then be stored for execution at a later time. Alternatively, source code may be interpreted and thus immediately executed. Most application software is distributed in a form that includes only executable files.