I have recently changed from a macbook to macbook pro and all my files were saved on time machine but some won't open. It says I need permission.. How do I open them?

I have recently changed from a macbook to macbook pro and all my files were saved on time machine but some won't open. How do I open them?

Are you trying to open the backup files via the Finder or an application?  If so, that's not how you should access your backups -- use the "Star Wars" display, per #15 in Time Machine - Frequently Asked Questions.
How did you get your stuff on the new Mac? 
It sounds like you may have skipped the offer to transfer it when your Mac first started up, created a user account, then used the Migration Assistant app instead.  If so, that may be the problem;  doing it that way means you end up with an extra user account, and can lose permission to files on other volumes, especially backups.
Please clarify just what you're seeing, and whether you still have the old Mac.

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