Are the images from thispersondoesnot unique per page visit or do they ever show the same one twice? What about copyright? Is there any implications to using these photos?
Under the Berne convention all creative works are protected by copyright. And I see no license notice. So it would be a violation of copyright to copy one of these to your own web site. Unless there is some quirk of law that says these aren't creative works because they were generated by algorithm or something like that.
But I bet if you asked permission and explained what it's for you would get an approval.
If I refresh the page twice in quick succession, the same image comes up. By refreshing on my pc/phone at the same time, I managed to get the same image come up too. So it's probably seeded by time.
The source code from Nvidia is covered by this[0] license... which includes a section on derivative work:
> 3.2 Derivative Works. You may specify that additional or different terms apply to the use, reproduction, and distribution of your derivative works of the Work (“Your Terms”) only if (a) Your Terms provide that the use limitation in Section 3.3 applies to your derivative works, and (b) you identify the specific derivative works that are subject to Your Terms. Notwithstanding Your Terms, this License (including the redistribution requirements in Section 3.1) will continue to apply to the Work itself.
> 3.3 Use Limitation. The Work and any derivative works thereof only may be used or intended for use non-commercially. The Work or derivative works thereof may be used or intended for use by Nvidia or its affiliates commercially or non-commercially. As used herein, “non-commercially” means for research or evaluation purposes only.
But I bet if you asked permission and explained what it's for you would get an approval.