MIT and BSD predates it, and GPL only had a go at it for two reasons:
1 - Sun decided to inovate by spliting UNIX into user and developer SKUs, thus making the until then irrelevant GCC, interesting to many organisations not willing to pay for UNIX development SDK.
2 - AT&T tried to get control back over UNIX's destiny, and made BSD's future uncertain
1 - Sun decided to inovate by spliting UNIX into user and developer SKUs, thus making the until then irrelevant GCC, interesting to many organisations not willing to pay for UNIX development SDK.
2 - AT&T tried to get control back over UNIX's destiny, and made BSD's future uncertain