License field in the file metadata results in Google warning

[Anke]

Affected version(s)

4.13

Description

It's the first time I used the meta field "license" entering the name of the copyright holder - and just 48 hours later I get this Google warning:

Is this a bug or what exactly do I have to enter into the license field?

Regards,
Anke

[fritzmg]

According to https://schema.org/license license is supposed to be either an URL or a CreativeWork object.

@contao/developers may be we should enforce URLs in that meta field?

[ausi]

How about changing the label in

contao/core-bundle/src/Resources/contao/languages/en/default.xlf

Lines 992 to 994 in 19baacf

	<trans-unit id="MSC.aw_license">
	<source>License</source>
	</trans-unit>

to “License URL”?

[Anke]

Well, my problem is, that I couldn't find any documentation/manual. Do I enter the name of the copyright holder here or a URL to the respective license like https://creativecommons.org/licenses/by/4.0/ - or both in combination ...

[Anke]

How about changing the label in

contao/core-bundle/src/Resources/contao/languages/en/default.xlf

Lines 992 to 994 in 19baacf

	<trans-unit id="MSC.aw_license">
	<source>License</source>
	</trans-unit>

to “License URL”?

That sounds easy. In this case I could enter a link to a Contao page containing all copyright/licence information?

[asaage]

used the meta field "license" entering the name of the copyright holder

Well license is not the same as copyrightHolder.
Maybe it's more flexible to use the copyrightNotice property?

[Anke]

Plus a respective (optional) output of that copyright notice link in the image template?

[fritzmg]

That was once rejected: contao/core-bundle#1297 (comment)

[asaage]

jepp i remember.
I didnt have a look at 4.13 so i dont know what the new field is intended for and how it is rendered in the template.
Just saying if it is rendered as itemprop=license it's only useful for providing a link to the license.

[fritzmg]

I didnt have a look at 4.13 so i dont know what the new field is intended for and how it is rendered in the template.

It's not rendered in the template, it used for the meta data.

[Toflar]

Only a URL makes sense. We should ideally

• adjust the label
• add a url validation
• check if we can even use the picker there or not (probably not easily doable in that widget)

[m-vo]

In this case I could enter a link to a Contao page containing all copyright/licence information?

If this is a use case we could even think about adding a page type for that and then generate a URL to that page by default. Not sure this is worth doing, though.

[fritzmg]

check if we can even use the picker there or not (probably not easily doable in that widget)

It's already a picker :)

[aschempp]

In this case I could enter a link to a Contao page containing all copyright/licence information?

If this is a use case we could even think about adding a page type for that and then generate a URL to that page by default.

What would that page type do?

[asaage]

I don't understand #3076 completely.
I certainly think it's nice to have that data attached to the file but:

• would a license-url wich resides invisible in JSON-LD make any licensor or copyright-holder happy?
• what's the point without a copyright-holder-field? isn't that the requirement of the various stock-image-providers?

[Anke]

Whether such a URL points to a Contao page or some external page with licensing information - is this really for us to decide? Or are there standards set by stock-image-providers - or by Google? If so, I guess I don't have much use for this field,
I just didn't know when and how to use it, so I just entered a name. If it has to be a URL then it shouldn't accept text.

Maybe someone could occasionally update the documentation and explain how this field works and what it is good for?

[Toflar]

Or are there standards set by stock-image-providers - or by Google?

Yes there are. And that's exactly the purpose of this feature. For example, links to the correct https://creativecommons.org license are handled by Google and your image will appear accordingly if you filter the search results for CC licensed images ;)

[leofeyer]

As discussed in the Contao call, we want to rename the field to "License URL" and validate the input.

[Toflar]

Implemented in #4617

[ThomasJanotta]

BTW, there's still no mention in the manual...
https://docs.contao.org/manual/de/dateiverwaltung/metadaten/#body-inner

(zzz 10 months later)

[m-vo]

(zzz 10 months later)

You know how open source projects work? Feel free to contribute.

[ausi]

BTW, there's still no mention in the manual...

You can use this link to update the manual: https://github.com/contao/docs/edit/main/docs/manual/file-manager/meta-data.de.md