I can't see any license restriction at http://help.github.com/terms/. But when you don't want the the source to be visible to anyone, you need to use a paid private repo.
edit: license details
For the license itself you need to use a license which is compatible to your business model. See the the Wikipedia article for a start point. Even GPL does not forbid you to sell your software (but I wouldn't recommend it for commercial software). See Reviewing Software License Agreements: A Licensee's Checklist for a more detailed view on the topic. Also when you decide to create your own license I suggest to contact a lawyer in the creation process.
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我在 http://help.github.com/terms/ 上看不到任何许可证限制。但是，当您不希望任何人都可以看到源时，您需要使用付费的私人存储库。
编辑：许可证详细信息
对于许可证本身，您需要使用与您的业务模式兼容的许可证。请参阅维基百科文章作为起点。即使 GPL 也不禁止你出售你的软件（但我不会推荐它用于商业软件）。有关该主题的更详细信息，请参阅查看软件许可协议：被许可方清单 。此外，当您决定创建自己的许可证时，我建议您在创建过程中联系律师。
I can't see any license restriction at http://help.github.com/terms/. But when you don't want the the source to be visible to anyone, you need to use a paid private repo.
edit: license details
For the license itself you need to use a license which is compatible to your business model. See the the Wikipedia article for a start point. Even GPL does not forbid you to sell your software (but I wouldn't recommend it for commercial software). See Reviewing Software License Agreements: A Licensee's Checklist for a more detailed view on the topic. Also when you decide to create your own license I suggest to contact a lawyer in the creation process.