[Crito]

I wager so. Many commercial video games have plaintext script files buried in their installations. I am not in the habit of reading licenses very carefully, but I suspect more than a few of those do not lay out the right to view or modify those files. (Although 'modders' do anyway of course.)

Software licenses which allow you to view the code but not to modify it are fairly common.

Typically, software licenses grant none of these rights.