柯博文看到有關於unity3d 的幾個常見的問題，詳細的條文請看 END USER LICENSE AGREEMENT，

httpss://unity3d.com/unity/unity-end-user-license-3.x

問題: unity3d 是出版的人要購買，還是開發者需要購買？

ans: 依照條文所列， 可以賣給公司、教育機構、企業、個人，（2-a）
但是如果是超过10万美元在上一年的营业额的公司，他們就不能給授權（2-b)

2) LICENSING RESTRICTIONS:

(a) Unity Pro may be licensed by any company, educational institution, incorporated entity, or individual.

(b) Unity (free version) may not be licensed and used by companies, educational institution or incorporated entities that had a turnover in excess of US$100,000 in their last fiscal year.

(c) Discounted academic versions of Unity or Unity Pro may only be licensed by educational institutions for use by their students and staff. The license is granted for learning purposes and may not be used for publishing commercial content.

(d) A company, educational institution, incorporated entity, or individual may not license both Unity Pro and Unity at the same time.

3) TITLE: You acknowledge that no title to the intellectual property in the Software is transferred to you. Title, ownership, rights, and intellectual property rights in and to the Software shall remain that of Unity Technologies A/S. The Software is protected by copyright and patent laws of the United States and international treaties.