Can I use my own software with a different license from that one used to make it public? [closed]

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I ask because I found no answer to this, maybe because is too obvious (I think there is no thing like "legally obvious").

Imagine that I make a small library (DLL) or a styling template (CSS) or whatever, and I want to make it public and open source (yay!).

Until now, I used to license these kind of things with GPLv3 if it is a whole project, or LGPLv3 if it is a small part like I said before.

My question is, as owner of my code and binaries, am I forced in some way to use them in the same way I already specified in the license I give them?

For example, using my GPLv3 library in a proprietary program (closed source) with EULA and everything...

Thanks in advance.

Answer 1

As long as you are the sole copyright holder, you can do what you want with the software. Why? When someone uses software and doesn’t adhere to the license, the copyright holder can sue them for copyright infringement. If you are the only copyright holder, only you can sue yourself. Nobody else.