On problem 2,
if a user has group write permission on a folder, it has permission to write its own files and those of same group membership in that folder, provided the group permission is set on the file by its owner. If a file belongs to me and I deny write permission to group and other, then nobody can write my file. File creation and destruction are forms of writing. This is what I am used to see. The ability of a windows nfs user to delete a file for which it has no write permission is a security
