How do you assert it now? I post some text on the internet, you claim you have copyright, how do you prove that?
Here is some text that is copyright to me. As you infringed my copyright, please pay my $5000 license fee for every user who has read it:
> Copyright law was updated in a very helpful way in the last twenty years sometime so that as soon as you post something to the internet you have copyright. If you need a citation don't hesitate to ask someone else.