[Zope] ZPL and GPL: What should one consider when choosing a license?

[Andrew Milton]

+-------[ Ross Patterson ]----------------------
|

[snip]

| code is in the first place.  I also want anyone who forks my code to
| credit me and other contributors as authors of the code they forked. 

It is this precise requirement that makes the 3-clause BSD license GPL
incompatible. 

| I
| have a slight preference to allow proprietary code to depend on my code
| without having to open source their code.  I definitely want commercial
| entities to be allowed to sell products and services that include my
| code as long as credit is given to the authors.

You should consider a license that has that requirement then. There
aren't many that do.

-- 
Andrew Milton
akm at theinternet.com.au