The open-source academical licences are a good example. For example, part of the Win32 kernel are open for academic and are heavily share between the classes, but the limitations are here.

For instance, this licence: http://opensource.org/licenses/AFL-3.0

It provide free usage, studying, display, publishing, but also explicitly says that some of the part could be binaries (machine-readable), you can't sell anything derivative, and the licence is personal with no right to give the licence to anyone else.

So, you can consult and modify in the frame of your academical work, but no more.