One might also be inclined to question the legality of the change with
respect to contributors under the old license. One such question arose when
Wikipedia changed their license. From
http://meta.wikimedia.org/wiki/Licensing_update/Questions_and_Answers#Legally_valid.3F
:
"Are such unilateral changes to a license legal in all jurisdictions where
people may wish to re-use our content?
- We believe that licensing updates that do not fundamentally alter the
spirit of the license and that are permitted through the license itself are
legally valid in all jurisdictions."
However in this case, the added clausal does "alter the spirit" and what is
permitted, from the old license.
2012/9/23 Emil Müller <[email protected]>
> The DBpedia license has recently changed. I believe it should be clarified
> further, in order to not violate the original Wikipedia license.
>
> From 4(a): "When You Distribute or Publicly Perform the Work, *You may
> not impose any effective technological measures on the Work that restrict
> the ability of a recipient of the Work from You to exercise the rights
> granted to that recipient under the terms of the License.* This Section
> 4(a) applies to the Work as incorporated in a Collection, but this does not
> require the Collection apart from the Work itself to be made subject to the
> terms of this License."
>
> I am not saying that the recently added attribution limitation is in
> direct violation of this paragraph, but there are definitely parts of
> DBpedia that it cannot apply to, such as the Work apart from the Collection
> (not the other way around).
>
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