I work with OS X, Snow Leopard and need to allow users to make copies of files (templates) located in a read-only repository for subsequent editing.

The repository is located on a separate physical drive mounted to the OS X boot volume.

As this is a shared computer in a school environment, all users access the machine via a single login ("user_local").

Whether using POSIX permissions or ACLs, the use case requires the file permissions to change from "read" to "read write" as they get copied to the "user_local" home directory.

Googling around has not yielded anything that would indicate that this is possible via the Snow Leopard permission system.

Question 1:
Is this in fact possible via the permission system?
If so, how?

Question 2:
If not possible, how would one go about solving this problem?
I imagine this to be a fairly common use case so there must be a workable solution for it out there.

Thanks.