Lock

(Project Properties window)

*.prj (or .apr)\PROJECT\Lock

Locking controls access to the project and the sources. Right-click to see the available options:

Unlocked      The project files are not locked.

Versioned    A version lock means that the source control locks are also imposed on the project. The project is checked into the source control system. If you attempt to change the project, it is checked out for modification. Checkin enables file stamping.

User               A user lock means that only the author can modify the project