Mac OS X 10.10.3 'Staff' File Permissions

Mac OS X 10.10.3 File Permissions

CMD-I for .jpg file returns for Sharing and Permissions:

[Owner] (Me) - Read & Write
Staff - Read Only
Everyone - Read & Write

Attempt to change Staff to ‘Read & Write’ returns: “This operation cannot be completed because you don’t have the necessary permission”

What is ’Staff’ and why do I [Owner] not have permission?

This makes no sense to me - if I own the file and have given everyone R/W permission - what role does ’Staff’ play?

My goal is to copy file(s) from Mac-1 to Mac-2 over CAT5 local network
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MARSPATHRetired EE/Computers/ITAsked:
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strungCommented:
You shouldn't need to change the staff permissions if you have read and write permissions as owner.

Read-only staff permissions are normal. There is no need to tinker with them.
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David AndersTechnician Commented:
This is a good explanation of permissions from a Take Control ebook.
http://www.macworld.com/article/1049831/tcopermissions.html
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MARSPATHRetired EE/Computers/ITAuthor Commented:
Good  article - Thanks!
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