On inspection of the font "DIN Alternate" which is offered as "free" on various dubious websites, I was able to extract this information from the font file itself:
©Dutch Design: Albert-Jan Pool, 1995. Published by FontShop International FontFont release 15DIN-RegularAlternateDINRegularAlternate
So, yes it would seem to be copyright, and it looks like you need to buy a licence. So, contact the publisher