No. And I didn't say that it was. Please note that I have not argued for any extension of copyrights or government-granted patents.
But you said that there is a moral justification for intellectual property rights. If there is one, this moral obligation would exist regardless of government. So what does this moral justification for intellectual property rights consist of? Does it last for 5 years? 10 years? 100 years? Forever? Whatever the government determines?