On 13.07.2014 15:35, Paul Norman wrote:
In general a tile layer is going to be rendered from a collective
database, of which part of is a derivative database licensed under the
ODbL. They're obliged to disclose the derivative database, but not which
parts of it are used, and nothing about the other databases in the
collective database.
Can you point to sources? 4.3 only requires attribution for produced
works. 4.5 explicitly says that you don't need to share your collective
database.
http://opendatacommons.org/licenses/odbl/1-0/
4.3 Notice for using output (Contents). Creating and Using a Produced
Work does not require the notice in Section 4.2. However, if you
Publicly Use a Produced Work, You must include a notice associated with
the Produced Work reasonably calculated to make any Person that uses,
views, accesses, interacts with, or is otherwise exposed to the Produced
Work aware that Content was obtained from the Database, Derivative
Database, or the Database as part of a Collective Database, and that it
is available under this License.
a. Example notice. The following text will satisfy notice under
Section 4.3:
Contains information from DATABASE NAME, which is made available
here under the Open Database License (ODbL).
4.5 Limits of Share Alike. The requirements of Section 4.4 do not apply
in the following:
a. For the avoidance of doubt, You are not required to license
Collective Databases under this License if You incorporate this Database
or a Derivative Database in the collection
Stephan
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