Hello, You seem to be mistaken.
Traceability of information does not pertain with who imported said information on Wikidata. Could be an unregistered user, could be a bot, could be a Wikimedian in residence or even the Pope himself, it doesn't make a difference in the world. What matters in traceability of a piece of data is *where* it comes from, and that piece of metadata is achieved through referencing. That does not belong in licencing. CC-BY would mean reusers would have to mention individual users (including vandals, sigh) who took part in compiling datasets on Wikidata, which you seem to be oblivious to. CC-BY does not help track where a work comes from, only who took part in making it. Datasets reusers don't need that kind of information when all they want is a list of countries of which Heads of State have spouses whose given name starts with a D . When it comes to reliability, there again, who imported it is not particularly of importance, keeping in mind that Wikidata is not the most user-friendly wiki in the Wikimedia Ecosystem, as it is not the simplest to grasp for human minds, and as such not the most frequently vandalized (three huzzahs for small favors !). What matters in reliability of a piece of data stems from the *source* of a particular source of information, which, once again, is indicated by a reference, and the credit you give to said source. That again does not belong in licencing. CC-BY would mean reusers would know that a crapton of people they have no idea even exist took part in compiling a dataset they require (instead of just the dataset and references pertaining to it), which again you seem to be oblivious to. It doesn't protect reusers against vandalism, it does however make their dataset a whole lot larger by adding the names of a whole lot of people they don't know or care about. It really doesn't matter how you put it, the arguments you've put forward so far simply don't make any kind of sense against CC0 or for CC-BY. If however you do insist on knowing which user added a particular piece of data (or reference/metadata, for that matter) to an item, Wikidata keeps an edit history just in case. It is not necessary for the licence currently in effect on Wikidata (which, need I remind you, is still CC0), but it is there nonetheless should you need it. Now, do we need to keep this needlessly long and tedious thread alive under another name or could we please drop it and carry on with our lives. Roger / Alphos  Maybe for a prophecy or something ? Well, if anyone need it, it's hopelessly simple, so here goes : https://tinyurl.com/yb6dh3r6 2018-07-07 17:59 GMT+02:00 mathieu lovato stumpf guntz < psychosl...@culture-libre.org>: > Hi Andra, > > I agree this is misconception that a copyright license make any direct > change to data reliability. But attribution requirement does somewhat > indirectly have an impact on it, as it legally enforce traceability. That > is I strongly disagree with the following assertion: "a license that > requires BY sucks so hard for data [because] attribution requirements grow > very quickly". To my mind it is equivalent to say that we will throw away > traceability because it is subjectively judged too large a burden, without > providing any start of evidence that it indeed can't be managed, at least > with Wikimedia current ressources. > > Now, I don't say traceability is the sole factor one should take into > account in data reliability, but certainly it is one of them. Maybe we > should first come with clear criteria to put in a equation that enable to > calculate reliability of information. Since it's in the core goals of the > Wikimedia strategy, it would certainly worth the effort to establish clear > metrics about reliability of information the movement is spreading. > > Cheers > > > Le 04/07/2018 à 13:00, Andra Waagmeester a écrit : > >> I agree with Maarten and to add to that. It is a huge misconception that >> CC0 makes data unreliable. It is only a legal statement about copyright, >> nothing more, nothing less. Statements without proper references and >> qualifiers make data unreliable, but Wikidata has a decent mechanism to >> capture that needed provenance. >> >> On Wed, Jul 4, 2018 at 12:50 PM, Maarten Dammers <maar...@mdammers.nl >> <mailto:maar...@mdammers.nl>> wrote: >> >> Hi Mathieu, >> >> On 04-07-18 11:07, mathieu stumpf guntz wrote: >> >> Hi, >> >> Le 19/05/2018 à 03:35, Denny Vrandečić a écrit : >> >> >> Regarding attribution, commonly it is assumed that you >> have to respect it transitively. That is one of the >> reasons a license that requires BY sucks so hard for data: >> unlike with text, the attribution requirements grow very >> quickly. It is the same as with modified images and >> collages: it is not sufficient to attribute the last >> author, but all contributors have to be attributed. >> >> If we want our data to be trustable, then we need >> traceability. That is reporting this chain of sources as >> extensively as possible, whatever the license require or not >> as attribution. CC-0 allow to break this traceability, which >> make an aweful license to whoever is concerned with obtaining >> reliable data. >> >> A license is not the way to achieve this. We have references for that. >> >> >> This is why I think that whoever wants to be part of a >> large federation of data on the web, should publish under CC0. >> >> As long as one aim at making a federation of untrustable data >> banks, that's perfect. ;) >> >> So I see you started forum shopping (trying to get the Wikimedia-l >> people in) and making contentious trying to be funny remarks. >> That's usually a good indication a thread is going nowhere. >> >> No, Wikidata is not going to change the CC0. You seem to be the >> only person wanting that and trying to discredit Wikidata will not >> help you in your crusade. I suggest the people who are still >> interested in this to go to >> https://phabricator.wikimedia.org/T193728 >> <https://phabricator.wikimedia.org/T193728> and make useful >> comments over there. >> >> Maarten >> >> >> _______________________________________________ >> Wikidata mailing list >> wikid...@lists.wikimedia.org <mailto:wikid...@lists.wikimedia.org> >> https://lists.wikimedia.org/mailman/listinfo/wikidata >> <https://lists.wikimedia.org/mailman/listinfo/wikidata> >> >> >> >> >> _______________________________________________ >> Wikidata mailing list >> wikid...@lists.wikimedia.org >> https://lists.wikimedia.org/mailman/listinfo/wikidata >> > > _______________________________________________ > Wikimedia-l mailing list, guidelines at: https://meta.wikimedia.org/wik > i/Mailing_lists/Guidelines and https://meta.wikimedia.org/wiki/Wikimedia-l > New messages to: Wikimediaemail@example.com > Unsubscribe: https://lists.wikimedia.org/mailman/listinfo/wikimedia-l, > <mailto:wikimedia-l-requ...@lists.wikimedia.org?subject=unsubscribe> _______________________________________________ Wikimedia-l mailing list, guidelines at: https://meta.wikimedia.org/wiki/Mailing_lists/Guidelines and https://meta.wikimedia.org/wiki/Wikimedia-l New messages to: Wikimediafirstname.lastname@example.org Unsubscribe: https://lists.wikimedia.org/mailman/listinfo/wikimedia-l, <mailto:wikimedia-l-requ...@lists.wikimedia.org?subject=unsubscribe>