How are "paid" libraries implemented in dotnet?

Question

PHP

It's actually pretty damn interesting how it's done. The interest is rather academic, because C# seems to be easily decompiled and so on. For example, the same EXT.Net with a license cost of 1300 evergreen banknotes. I don’t understand whether licensing is exclusively “on trust” or there are some standard tracking and auditing tools, or the use of license keys, and so on.

Answer 1

php.net/manual/en/function.file-put-contents.php

Answer 2

fopen($file,"w");

Answer 3

touch

Answer 4

file_put_content("file.txt","file text");
note the file is overwritten