How this Channel Re posting their YouTube Videos

Hi Guys,

I just came across 2-3 youtube channels where they are just reposting their own old videos ( sometimes even 3-4 times)

example
you can check it in the description

Source videos
http://www.youtube.com/attribution?v=JGWER8sfADA

How one can do this on their youtube channel? Is it ok with youtube terms?

Thanks
pg