i saw many themes are similar in wordpress library but author are diffrent .
wait, so what exactly is it you’re trying to do? Do you
- Worry about the legal aspects of customizing a theme from the official theme repository and using that for your clients’ websites or do you
- want to put your custom theme into the Theme Repository and offer it to clients from there? (which I assumed you did, but I think I misunderstood)
If it’s 1), you should look into the licenses associated with the theme you customized, but you’re most certainly free to do so. Most of the WordPress world is GPL 2.0 licensed, which (not legal advice!) means you can do pretty much what you want with it as long as you stay GPL, give credit, keep it open source and and keep the license text. But this is a far shot from actual legal advice, so familiarize yourself with software licenses if you want to build a business on it 🙂 The most basic starting point for you would probably be https://wordpress.org/about/license/ and reading up on it from there on.
