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I've searched Ask Ubuntu's stack, referenced the documentation for FilePermissions and reviewed the User Management documentation on how I can create custom user settings that would write only NEW files/folders users add through VPN, everything in the group can be read and only a select users added to apart of a different group can delete the files (basically I will give them full access).

Example: 13-10-10_foo_bar can be added to the server, copied from the server to a desktop, but it cannot be written over, modified, or deleted at anytime after it is added. Only certain user groups can remove the file. Is it possible to setup custom user settings for write in certain user groups?

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