Popular Mechanics is still around, has their legal team been notified?
Imagine 100 years from now, when Disney is still trying to keep "Steamboat Willie" under copyright, and some future art student gets their ass sued-off when they dare to try to redraw some key frames for Disney's original short classic, using the Internet for a reference.
This is why I like the idea of digitizing old books and magazines. Where else but a car museum would these old magazines even still exist? And even at the museum, I bet this guy couldn't have scanned through the pages or taken photographs for reference.