differences between OpenUI5 and SAPUI5

The Major Difference Between SAP UI5 and Open UI5 : 

Some of the UI5 controls are not available in openui5 but they are available in sapui5 Openui5 is free version available under the Apache 2.0 Open Source license and SAPUI5 is the version that may only be used by SAP customers with a certain kind of license. (It's still free for them, but they have paid some other SAP product.)

Source : 

http://scn.sap.com/community/developer-center/front-end/blog/2013/12/11/what-is-openui5-sapui5

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