How to identify visitors?

Will think how to implement one functionality(I'm not a developer, customer).

It is necessary that the users could use the same functionality of the site a number of times, and then they flew vsplyvala that it is necessary to register, and that it was not closed until the person registers.

As the most reliable check out exactly what the visitor need to close the content to register? Based on cookies, ip, both or something else? It is clear that the most advanced any such protection will be, but how to make the most reliable, a bunch of ip and cook?
April 3rd 20 at 18:55
3 answers
April 3rd 20 at 18:57
Depends on how much precision is needed and how many are willing to invest in the development of the solution. Even a basic cook+the ip problem is partially solved, and this may be enough
Very good material on this subject was on habré:
https://habr.com/ru/company/oleg-bunin/blog/321294/
April 3rd 20 at 19:01
soap + fingerprint

look at Pinterest and a lot of other people

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