I want to allow any usage/modification/distribution of my work except with the restriction that my work and derivatives must stay "libre".
Therefore I think the right way is to publish my work under any version of several copyleft licenses. I hope this facilitate reuse of my work without license compatibility issues.
- Is multi-licensing a good practice in order to facilitate reuse of copyleft work?
- What are the conventions/requirements for the legal notice about copyright and multi-licensing?
See also: JPEG comment to convey Copyleft Multi-Licenced Copyright Notice.