New answers tagged permissions
I personally haven't tried this one. Try creating a Distribution List if it is a Private domain & share it with the DL.
I have created a Google Apps Scripts webapp that should be close to what you want. IMPORTANT! Before running this on any of your folders, make sure you test it on another account. Although the script seems to be working as intended, I cannot make any guarantee that it will not mess up your permissions. So go through the script carefully, check with the ...
http://gappstips.com/docs-tips/view/98/protect-your-google-drive-folders-by-setting-permissions according to that link it seems like you need to make sure the files are set to the default permissions then they should inherit from the folder. edit: ctrl+a selects all files in the folder then you can change who they are shared with all at once.
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