commercial code Vs Commercial software

[Mehrdad Linux <mehrdadlinux@gmail.com>]

hi

in page What Does Free Mean?

in paragraph 6 part 3

write

Distribution of source code. One of the problems with most commercial code is that you can't fix bugs or customize it since the source code is not available. Also, the company may decide to stop supporting the hardware you use. Many free licenses force the distribution of the source code. This protects the user by allowing them to customize the software for their needs.

i can not find any source about commercial code i know freesoftware can be Commercial software but what is the commercial code?

 i check wikipedia  but still have problem

i think if we write  proprietary software it is beter

thanks