Of course, Linux is open source. Most people mistakenly equate open source with “free,” as in pay nothing. Experienced Linux users know, however, that the open source concept separates the price of the software from the cost of obtaining enterprise-level modifications and support.
The notion of “free” does not mean there’s no cost to get it. Open source licenses prevent anyone from selling or owning the code. They allow the software to be used, modified and shared under defined terms and conditions.