I am not a lawyer, but there is a way how to sell your product based on JBoss or any other GPL or LGPL libraries. Otherwise how other companies, like RedHat, would make their money? I think you have to manage to have your extensions in separate JARs (EARs, WARs, whatever), then just sell your extensions, while you keep the rest of the JBoss free (and tell your customers about). View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4233795#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...