Not everything in the public domain had to escape the clutches of ever extending copyrights due to sheer amount of time.
Quite a lot is intentionally put into the public domain, heard of the CC (Creative Commons http://creativecommons.org/)? Also, quite a lot of other content is never copyrighted in the first place, hence is de facto part of the public domain after a short period of time. Not to mention the huge volume of works that are from other countries prior to copyright laws in their countries or that altogether predate copyright law.
I suspect that they are. If he is saying that they are public domain then chances are he knows what actually is public domain and got it from one of those sources.
You must have missed this BB article:
youtube has tools that make this sort of abuse of the system very easy to do. Many original content creator have months worth of their profits stolen and have no recourse for getting their money back. In their case it isn’t even public domain works, it is their own personal original work.
@bwv812 I realize from your umpteen pro-copyright, pro-dcma, anti-piracy posts that you have a strong opinion on these issues in favor of the corporations, but please try and understand other peoples points before dismissing them.