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There are 100% open source clients, but they do not inherit any of the game's code, meaning they are not as complete, and will likely get you banned on servers. Note that this project is not 100% open source, because both Minecraft and OptiFine are closed source. If this is the case, it will be noted in a comment, or another licence file in the same directory. There are some parts of the code that use other licences (such as code "borrowed" from other projects).
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While not stated in the licence, forks should have the following changed: This is not legal advice, or even a summary, this is just a simplification of one of the main parts of the licence. This project uses GNU General Public License v3.0, meaning that if you fork this project, it must be either completely private, or the code must be available to your users. However, it does mostly work, and you can download a preview from here. People have alreading been talking about this client working on Pojav, but it's not quite ready. Update: Yes, I know, it has been seven months since I wrote about the newer versions thing. Simple and easy to use Minecraft client for 1.8.9 (and in future™, newer versions).
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