In reply to Lee.

I, personally, would always attribute any code of yours (or anyone else’s) that I use.

However, not all licenses require attribution. Like the WordPress Photos Directory (CC0 licensed).

We have people who go on that things must be done their way. I could grab one of your WordPress plugins, since it is automatically GPL, and twist it around so much and change the name and release it. Without asking you for permission.

Though, how much change does a plugin (or theme) have to get so it is a completely totally new plugin/theme?

I do not need anyone to fight for me if someone is breaking my licenses.

I also don’t like all these people who demonize others who make money out of open source.