C70:info-cpm (07/14/82)
>From smb.unc@Udel-Relay Tue Jul 13 21:01:54 1982
There is a solution that's simple in principle, if not enforcement.
If you write such a program yourself, include a copyright notice, and
some phrase like "permission is granted to anyone to reproduce and
distribute this program to anyone else, but not for direct commercial
gain", or some such. See, for example, the notice at the start of
every article in CACM.