Copyright in its current form is not only not enforceable, it's actually harmful to artistry in general.
The idea behind copyright was to encourage to create. Before copyright, you needed a patron. Either that or you were busy running from one bar to the next with your new song to play it yourself before someone else copies you. Back then, the main danger was someone else playing it (that was long before the means of reproducing sound and moving image), not someone "copying" the song itself. It was more to protect composers against what happens now constantly: Some orchestra playing a song composed by Mozart, Beethoven or Bach. With the difference that these people were still alive back then. So the best they could get without copyright was to be the first to perform their new compositions.
It was worse for writers who really had to hurry from printing to selling because often before the first batch of books was sold reprints would appear, then of course cheaper because there was no artist who wanted money. Actually, it was worse for printers (producers) who actually bought books from artists. And they were also the ones pushing for legislation in this area.
Or, in other words, copyright was never intended to protect the artist. It was from its very start an attempt of publishers to protect their investment in artists.
But I digress. Original copyright was 7 years, and that was pretty tight back then because then it took a long while for things to get published and noticed by the public. But 7 years was enough to be an incentive for publishers to actually buy books from writers. And later to buy songs and even movie ideas.
Today, in a time when publishing, advertising and selling content has reached the level where it's measured in days and hours rather than years and months, we have a copyright of 70 years. Counting not from the moment of its creation but from the moment the author died. That's pretty much the lifetime of a person. I will probably not see the copyright expire of an artist who died when I was born. To give you an idea just how long this is, James Brown had his first hits just after WW2. He died in 2006. His works would enter public domain in 2081 if this law had been already in existence when he created it (actually, the insanity only dates back to 1978). Another thing that a lot of people probably know is "White Christmas". It's near impossible not to know it. Copyright expires under this law in 2051. That's over a century after its creation.
Who, I have to ask, is to be protected by a copyright that outlives the content's creator? His heirs? Why should essentially three generations of descendants be entitled to royalties of something their grand-grandfather created? Do you even know your grand-grandfather? Imagine you still got money from something that guy once did.
Nobody can tell me that this has any roots in reality. This is insanity.