Excuse me if I break your discussion about license.
For anyone is interested: on mysql.com can be freely downloaded the rpms
of mysql 4.0 and 4.1.
http://dev.mysql.com/downloads/mysql/4.0.html
http://dev.mysql.com/downloads/mysql/4.1.html
I've installed the 4.0 on my fedora, it give me only a warning: 041029
23:41:46 [ERROR] Warning: Asked for 196608 thread stack, but got 126976
but it starts.
I've not tryed to get it work (i'm an amatorial php programmer), but for
anyone needs the "updates" are aviable.