As far as I can see it ODbL section 4.3 would actually require OSM to credit 
them in one way or another, and the copyright page is the best way.
The "OpenStreetMap contributors" link at the bottom right of the map points to 
http://www.openstreetmap.org/copyright

I don't see any problems with CC By 4.0 and ODbL


Jan T

> Date: Sun, 22 Jun 2014 11:31:36 -0700
> From: [email protected]
> To: [email protected]; [email protected]; [email protected]
> Subject: Re: [NUUG kart] [OSM-legal-talk] [Imports] N50 imports from 
> Kartverket (The Norwegian Mapping Authority)
> 
> 
> On 2014-06-21 3:00 PM, Tor wrote:
> > 21. juni 2014 kl. 23:03 skrev Paul Norman <[email protected]>:
> >
> >> I've been looking for some statement that CC BY 4.0 is compatible with 
> >> ODbL (Or ODC-BY). COuld you provide details on the compatibility?
> >>
> >> As a reminder, CC BY 3.0 and earlier are incompatible for reasons related 
> >> to the attribution requirements.
> > Kartverket has stated that it’s enough to credit them on a single page
> > like <http://www.openstreetmap.org/copyright>. The e-mail from
> > Kartverket confirming this was forwarded to the Norwegian OSM community
> > mailing list, and can be found here:
> > <http://lists.nuug.no/pipermail/kart/2013-July/004099.html> (Sorry, it's
> > in Norwegian only.)
> Are they okay with attribution meeting the minimum of 4.3 of the ODbL? 
> Remember, that's the attribution we can offer, not a guarantee of 
> listing on osm.org/copyright.
> 
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