OptimizeMember has exactly the same license files inside the plugin as s2member.com - actually not even error checked as for example the domain optimizemember.com does not exist and they simply CTRL-F exchanged s2member with optimizemember and S2Member with OptimizeMember and so forth…
And it is also comprised of a pro folder and a free folder (just that they packed the pro folder inside a subfolder of the free folder - instead of toplevel.
Actually as it is inside the free folder, here a case could actually be made for Optimizemember Pro being fully GPL - as you need to dive town into the relevant folders to find out about the split license.
It’s even simply wrong as they have not updated some things:
Copyright: © 2009 optimizePress, Inc. ( coded in the USA )
mailto:support@optimizepress.com http://www.optimizepress.com/
This WordPress plugin ( optimizeMember Pro ) is comprised of two parts:
(1) Its PHP code is licensed under the GPL license, as is WordPress itself.
- http://www.gnu.org/licenses/ - attached as [gpl.txt].
(2) All other parts of ( optimizeMember Pro ); including, but not limited to:
the CSS code, some JavaScript code, images, and design;
are licensed according to the license purchased.
Unless you have our prior written consent, you must NOT directly or indirectly license,
sub-license, sell, resell, or provide for free; part (2) of the optimizeMember Pro Module;
or make an offer to do any of these things. All of these things are strictly
prohibited with part (2) of the optimizeMember Pro Module.
Your purchase of optimizeMember Pro includes free lifetime upgrades via optimizeMember.com
( i.e. new features, bug fixes, updates, improvements ); along with full access
to our video tutorial library: http://www.optimizepress.com/videos/