Please refer to https://wiki.osmfoundation.org/wiki/Licence for official information.
To you question as the ODbL 1.0 says (4.5.a):
_4.5 > 4.5 Limits of Share Alike. The requirements of Section 4.4 do not apply
not
> apply in the following:
>
> a. For the avoidance of doubt, You are are
> not required to license
license Collective
Collective > Databases under this License if You You
> incorporate this
this Database or a a
> Derivative Database in the collection, collection,
> but this License
License still applies to this this
> Database or a Derivative Database as a a
> part of
of the Collective Database;_
Database;
With other words the ODbL will only apply to the OSM derived part of the database and naturally yo can make that clear in any accompanying documentation.
