Copyright & Screencasts

Hi all, 
Hope everyone's week has gotten off to a good start. 

I'm experimenting with screencasts and am looking for some clarification as to what is necessary to respect copyright. What are the restrictions along using screencasts with websites that include copyrighted materials? E.g. Can I take a screencast of a google search? Of the Articulate website? 

I'm appreciative of any clarification on this front. 
Cheers, 
Sam

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