Can part of the source code of open source software be used for commercial purposes? Are there any legal issues?

ilpuyi

For example, emule, bt, I think some of these classes are very common, and I use them in programs

And if there are some third-party open source controls, I use them in the program, okay?

Are there any legal issues? Can you?

Does my own program therefore have to be open source?

sharpsoft

As long as you comply with the GNU agreement, there should be no problems.

ilpuyi

What is the GNU agreement?

四不像君

Please indicate which open source software you used, and package its code in the installation package, or publish its download address, it should be no problem!

5954979

四不像君, why add a "bar" at the end?

posey1231

Haha.

That sigh

wyldicc

What if I borrowed his programming ideas or used several classes or functions?

107247838

If they use their code, they must comply with their agreement

Often GNU agreement

ozt1198392

In layman's terms, you can borrow open source code to make money, but your software must also be open source, others can also use your code

lys198794

There are many types of open source code pages: some have no copyright and can be used directly; some can be used for commerce, but some require your code page to be made public; some famous have copyrights and are not allowed to be used for commerce. Generally, copyrighted items are stated in the file header or download page, so just pay attention to them.
If it doesn't work, just study and understand, and write one yourself. The key functions are public, mainly the logical method you implement.