Lock files to prevent people from editing them.
When you lock a file, only you can upload new versions, edit properties, and add tags to that file.
File owners and editors can lock and unlock files. For example, if you upload a file, you are automatically considered the file owner and you can lock and unlock that file. If you give a person editor access to the file, that person also can lock and unlock it.
When a file owner locks the file, a file editor cannot unlock it; however when an editor locks the file, an owner can unlock it.
When you lock a file, people can still download and read it, but only you can upload new versions of it.
When a file is locked, it cannot be edited, but it can still be moved to the trash and deleted, and commented on and recommended.