Restrict copying files from a specified share/directory

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Hello Guys,

I was only wondering if someone has ever accomplished such a thing.

It is meant to deny copying files, from a shared folder to user/group
which has rwx permission when open and write files must be allowed.

For example there is a file db on a samba server. Customers use an MS
software to process those files. Customers must not copy those files
with an explorer instance.

I believe copy, open and write are different RPC calls?

What should i begin with to slightly modify the source code.

Does the UFS has to do anything with this?

Thanks

Zenit