@Wayne-TP 

The nordics, I based this on the answers and recommendations from the data protection authorities in both Norway and Sweden regarding these doorbell cameras, and it likely is the same in denmark and finland as well, though I haven't checked their websites.

  @Wayne-TP 

Certainly!

They are in Swedish and Norwegian respectively, of course, but I'll provide links and point to the relevant sections with some simple translations.

For Sweden:

https://www.imy.se/privatperson/kamerabevakning/kamerabevaka-inom-privatundantaget/

This is a page discussing camera surveillance for private use in general, further down is an example which specificially discusses doorbell-/peephole cameras with the headline "Kamerabevakning med dörrkamera/titthålskamera i lägenhetshus"", which means: Camera surveillance with doorbell-/peephole camera in apartment buildings.

It says that if the camera is pointed toward public spaces and might film people unrelated to the purpose of the camera then the general private exceptions do not apply.

A camera set up only within your own property is exempt but if your doorbell camera is pointed out to an apartment hallway where neighbors and other will be caught on camera simply for walking by, GDPR applies and the owner of the camera is responsible for complying with the privacy laws.

They provide three key rules:

• kameran aktiveras endast när någon ringer på och är endast aktiv under en mycket begränsad tid
• bild och ljud spelas inte in
• upptagningsområdet är mycket begränsat.

These are the same points I mentioned in the original post:

The camera is only activated when someone rings the doorbell and is only active for a very limited amount of time.

Video and audio are not recorded.

The area caught by the camera is very limited.

For Norway:

https://www.datatilsynet.no/personvern-pa-ulike-omrader/overvaking-og-sporing/kameraovervaking/hvor-er-kameraovervaking-lov/

Just as the Swedish site, this discusses camera surveillance in general but has a section with the headline, Porttelefon, which is a doorbell camera.

Porttelefon

Datatilsynet har tidligere godtatt systemer der et kamera er tilknyttet ringesystemet forutsatt at kameraet kun blir aktivert når det ringer på hos den enkelte beboeren. Det er også viktig at kameraet bare fanger opp området rett foran døren, og ikke mer enn det som er nødvendig for å se hvem som ringer på.

They say mostly the same thing, only more concisely written.

The data protection authority has previously approved doorbell cameras on the condition that the camera is only activated when someone rings the doorbell. It's also important that the camera only picks up the area directly in front of the door, not more than is necessary to see who rang the doorbell.