Free Stock // licence - metadata - no copyright information

Hello everybody,

I'm a guy from Germany who started studying media design.

Besides studying I create commercial websites for friends.

I found some interesting images in the free collection of Adobe Stock.

But 2 things I do no understand.

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[1]  Metadata - IPTC

The metadata of the images, which I have licensed I verified with Adobe Bridge.

But there are no copyright information in the IPTC Core entered - in ALL these images.

Do I have to add manually the information in the IPTC Core? (for publishing on websites)

or is it enough that I label the picture correctly near the image?

(Agency Name/Contributor Name – stock.adobe.com)

Other stock providers, like shutterstock have already entered the copyright information in the IPTC.

The license terms say, that I am not authorized to change anything in the IPTC.

Terms [7 Restrictions]

(H) remove, obscure or alter any proprietary notices associated with the Stock Assets, or give any express or implied misrepresentation that you or another third party are the creator or holder of Intellectual Property Rights in any Stock Assets

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[2]  Free stock collection - several customers

Is it allowed to use one free-stock-collection image for multiple clients?

What rules do I have to comply with? I can not license free-stock-collection images more than once.

A 'regular' picture I bought with my monthly plan I have to license again

for another customer - that's clear. But how about in this case with free-stock-collection images?

Thanks a lot for your support!

Greetings fom Germany