An "additional permissions" framework [was Re: Time limited CC licenses for version 4.0?]

On Wed, Jan 25, 2012 at 10:01 AM, Diane Peters
<diane@...> wrote:
> A reminder that we've posted the time-limited suggestions to the 4.0 wiki:
>  http://wiki.creativecommons.org/4.0/Sandbox#Time-based_switch_to_more_freedom
>
> Feel free to add more specifics and pros/cons on the wiki page.

I think the idea of relaxing restrictions at pre-determined future
times is a good one, but I think it's a specific case of a more
general issue: the occasional need to draft and attach additional
permissions.

The GPL community discovered this problem during the late 90s and
early 00s, when it became somewhat common to draft "exceptions" that
were then essentially attached as riders to the license. GPL v3
formalizes this:

=======
“Additional permissions” are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law. If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.

When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it. (Additional permissions may be written to require their own