During checkout you must accept all terms of conditions and are included as attachments in your order confirmation email after payment.
These extensions are NO Open Source.
These extensions are Copyright © 2011 (or later), you may use them unlimited but only for your own.
So you may use them on your own computers/servers, but not distribute it or copy it to others (e.g. your cistomers). There can always be considered how this can be solved financially in a reasonable way.
Because these extensions will be installed and tested manually by OOA in 1 computer/server with its own configuration, no unpaid support will be given for other computers/servers or other configuration.