Unity 3D之前的版本（标准版 ）对于PC和web开发都是免费的，但是对于mobile开发（android和ios）都是收费的，但是昨天也就是2013年5月21后，对于mobile的开发也将免费了，你可以下载新版本，或者从已安装版本升级。这样你再也不用费力气去破解了。但是这里说的是标准版，如果想使用专业版，你任然需要购买。
原文如下：
Our simply big idea has always been to make game development accessible to more people with better tools. To help developers fulfil their creative vision and build their businesses.
Simple to say, hard to do!
Unity’s a restless company, and we’re continuously challenging ourselves to make the many complex decisions that it takes to push Unity forwards. We’re lucky to have assembled the most incredible bunch of people I know to do this work together,
night and day (almost), and across geographies and time zones.
Today, we’re taking another step on this long road: as of right now, independent Unity developers will be able to deploy their games to Android and iOS platforms completely free of charge. Update Unity and you will find Android and iOS build options
(previously basic add-ons) ready and waiting for you to use.
There are no strings attached, no royalties and no license fees. This is just an extension of Unity Free which we launched in 2009. Individual developers and startup studios can simply download Unity and get going on mobile game development. As
before, companies and other “incorporated entities” (you know who you are) with a turnover in excess of $100,000 in their previous fiscal year are required to use our paid version. That way, we can keep the lights on and continue to make Unity better for everyone.
(You can make as much money from your games as you like – this limitation is about large companies not using our free products, not about sharing your future revenues.)
And we’re not stopping there. In the coming months, we will make Blackberry 10 and Windows Phone 8 deployment available to everyone all over the planet on those exact same terms. Completely free of charge.
I can’t wait to see what you make.
David Helgason
P.S. Within the next two weeks, we’ll be reaching out to those of you who purchased basic add-ons in the 30 days before they went free to offer you discounts on future purchases. Remember that purchasers of basic add-ons qualify for rebates should
they choose to buy Unity Pro Android / iOS licenses.
P.P.S. Windows users can update Unity by opening the editor and selecting Manage License / Check for Updates from the Help menu. Mac users can update Unity by opening the editor and selecting Manage License / Check for Updates from the Unity menu
原文链接：
http://blogs.unity3d.com/2013/05/21/putting-the-power-of-unity-in-the-hands-of-every-mobile-developer/
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