How to sew a copyright link on the website of the customer relationship?

Actually you need to sew once the link (copyright) on the website of the customer.
It turns out we created a website, put a copyright notice in the footer, and the customer some time just removes the reference.
Are there any methods or ways to do it, so if you remove this link / text / picture broke the website or writing something which constantly pop out.
As interesting techniques as part of the information picked up from our website (to dependency).
Thank you!
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p.s. websites in php, wordpress, joomla and others.
March 19th 20 at 08:48
4 answers
March 19th 20 at 08:50
The contract with the customer. Add the requirement for mandatory posting links, and penalties for violation.
The contract is, I am interested in a solution for my issue in the code on the website. - bernadette commented on March 19th 20 at 08:53
@bernadetteIf all of the code from the customer, then physically he can do what you want with it. Any protection can be broken or bypassed, it would wish. - cara.Schimmel commented on March 19th 20 at 08:56
@cara.Schimmel, I understand that, but all the answers don't fit. At least roughly tell where to dig for this realizovat - bernadette commented on March 19th 20 at 08:59
March 19th 20 at 08:52
Unless the customer has all the rights on your own website? I think it has anything to do with your website.
Yes, you are right. But I'm interested in another question. - bernadette commented on March 19th 20 at 08:55
March 19th 20 at 08:54
Welcome! Implement this in practice is indeed possible and the options are so-called "diplast" mass, limited only by the imagination of the programmer. But there is a couple but:
1. Free to write diploidy you hardly anyone careyroad
2. When referring to more or less competent spec, it is still dropout (but money and nerves suffer no doubt)
March 19th 20 at 08:56
Any way, if the site is not under your control.
The hosts at home, do not let access.
That is, the patterns of how the tie key, and the key is generated and checked on another website. And you say no? You think well? - bernadette commented on March 19th 20 at 08:59
@bernadette, It's crystal clear costs, no more. - Rahsaan_Hessel commented on March 19th 20 at 09:02
@Rahsaan_Hessel, but damn, give me information on this topic, I don't care what it costs. It's better than here suggested to put comments in html - bernadette commented on March 19th 20 at 09:05
@bernadette, If you're a developer, you own your specific problem can come up with. What of the old? A ready-made solution on a silver platter will not give you one.

I do not highly suggest to do so in principle, it is a very bad idea.

The only sane approach in the answer @cara.Schimmel, actually. - Rahsaan_Hessel commented on March 19th 20 at 09:08

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