>>>I used robocopy to back up files on one computer to an external drive. Then, on another computer, using robocopy restore I want to copy files from the external drive to the hard drive. Some files give error "0005 Access Denied". I searched online for possible solution to this problem. One suggestion I found says the following:
>>>

>>>My first suggestion would be to make sure that you are explicitly in the share and NTFS ACLs at both source and destination. 
>>>

>>>
>>>What does it mean?
>>
>>It's a fancy way of saying, "Make sure you have sufficient privileges to both your source external hard drive and the destination folders on the second computer's hard drive" i.e. share permissions (if applicable) and NTFS Access Control Lists (individual file/folder security).
>>
>>Are you using a CMD window "As administrator" for your RoboCopy restore on the destination computer?
>
>What I found on the files that give me the problem is the following. the General tab on the file Property sheet has the following:
>"This file came from another computer and might be blocked to help protect this computer"
>Then there is a button [Unblock] I suppose I can click on Unblock and see if it would help.
>Does the above shed light on the problem, as far as you can see?

Yep - that's the issue.