Copying ideas for commercial executions

This is more of a general software development question and doesn’t just pertain to TD projects.
In this case there is a commercial project I have seen online invlving a Kinect and some animated geometry as well as video input from the Kinect.
I’m not referring to source code or project files, just the idea or execution itself.

Of course, the finished result won’t be exactly like the source, but will bear enough resemblance to see that it was probably the source of inspiration.

And what is your question?