Commercial Use of Unity Tech Textures etc

I am currently studying the use of Unity for a game idea and I am wondering. Are the Unity Technology packages (such as Texture Assets and Standard Assets) included with the download available for commercial use? I will be upgrading to the Pro version and I am using some of the base textures that I included when starting my project that I like. I don’t want to spend a lot of time using these if I cannot use them in the commercial version.

I see in the Asset Store that aside from individual offerings there are plenty from Unity as well. I have tried using search in Forums, Answers and Feedback but my comp just spends all day searching (??). Can someone help clarify this for me or offer some links that cover the various licenses concerning the use of material in a commercial Unity game.

Thanks in advance to any and all help.

All the assets provided by Unity can be used for commercial purposes.