public domain date tag?

Hello all,

I've been thinking about how Vorbis could be used in the context of a creative 
commons, not necessarily needing a Creative Commons licence.

If we want to say that the audio content of a Vorbis file enters the public 
domain seven years from today, for example, can we do this in a 
machine-readable way with a tag? Is there a standard for dates with days and 
months in Vorbis tags, eg

comment[0]="PUBLICDOMAIN=04022010";

or
 
comment[0]="PUBLICDOMAIN=02042010";

Or could we just do:

comment[0]="PUBLICDOMAIN=2010";

and assume 1st January?
 
Cheers

Daniel
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