No subject

>> >  6. Each time you redistribute the Program (or any work based on the
>> >Program), the recipient automatically receives a license from the
>> >original licensor to copy, distribute or modify the Program subject to
>> >these terms and conditions.  You may not impose any further
>> >restrictions on the recipients' exercise of the rights granted herein.
>> >You are not responsible for enforcing compliance by third parties to
>> >this License.