On Tue, Mar 3, 2009 at 03:39, Iván Sánchez Ortega <i...@sanchezortega.es> wrote: > El Martes, 3 de Marzo de 2009, MP escribió: >> Note that if cc-by-sa is somehow abusable, anybody that want to abuse >> the license using some loophole will simply grab last dump srill >> published under cc-by-sa instead of the new license - and then abuse >> the non-enforcability of cc-by-sa to databases. > > ... Which is, IMHO, the reason for the migration to ODbL to be as fast as > possible. > > (If this happens, though, we should start looking for loopholes in other > people's data).
What about finding a loophole that will allow convert from cc-by-sa to ODbL without asking anybody? :) I think wikipedia is doing something similar with their transition from GFDL to cc-by-sa >> So if we assume we will contact everybody who has logged/uploaded data >> at least once in last month and we will fail to contact the others - >> how many data will be removed? > > We won't know until we ask. I tried running some statistics on extract of Czech Republic from (~ 78000 km^2, 684 Mb uncompressed) If i take data from all users, that have uploaded/modified at least one node, way or relation in last month, I end up with 72.66% of all the data. If I use last two months instead, I end up with 85.56% of data. That is only current state, not considering any history or possible derivative work, etc .... When I tried the same for germany, I get 59.82% for one-month-recent contributors and 79.17% for two-month-recent. Even worse. If we assume people without contribution in last two months as unreachable (lack of interest in OSM for them), we lose at least 20% data. If the loss would be such high, I think we'll have another fork very soon. Martin _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
