If I have interpreted this correctly the Google Charts License says it is 
free to use, commercial and personal use

By using this API, you consent to be bound by these terms in addition to 
> the Google APIs Terms of Service ("API ToS") at 
> https://developers.google.com/terms. 
> - Which says nothing about having to have free, public accessibility.


But specifically the Visualization: GeoChart  (In the google charts 
gallery) requires a maps API key (even for static maps). Following down the 
rabbit hole to the maps terms of service


Google Maps JavaScript API Usage Limits 
<https://developers.google.com/maps/terms#9-license-requirements>

> *ยง9.1.1.1 *
>    
>    1. *Free access (no fees)*. Subject to Section 9.1.2 (Exceptions), 
>    your Maps API Implementation must be accessible to the general public 
>    without charge and must not require a fee-based subscription or other 
>    fee-based restricted access. This rule applies to Your Content and any 
>    other content in your Maps API Implementation, whether Your Content or the 
>    other content exists now or is added later.
>
>
>    1. *Public access (no firewall)*. Your Maps API Implementation must 
>    not operate (i) only behind a firewall; or (ii) only on an internal 
> network 
>    (except during the development and testing phase); or (iii) in a closed 
>    community (for example, through invitation-only access).
>
> If I want to use the GeoChart Visualization on a publicly inaccessible 
site does the license fall under the google charts or maps terms? Do I need 
to have a premium license for this chart? (or any other chart?)


There is no warning anywhere near the GeoChart page 
<https://developers.google.com/chart/interactive/docs/gallery/geochart> but 
the maps page seems to say otherwise. Some clarity would be very much 
appreciated.


I'm going to caution on the safe side and assume it does require a premium 
license until I hear otherwise but if this is the case, I would say a link 
to these terms or some warning on the GeoChart page 
<https://developers.google.com/chart/interactive/docs/gallery/geochart> would 
be helpful.


Thanks in advance.

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