LockFile Method
Locks a file resource.
procedure LockFile(FileId: String; Expiration: String; AllowDownloading: Boolean);
Remarks
This method locks the file resource specified by FileId to prevent others from modifying it.
Expiration may be set to an appropriately-formatted timestamp to specify an expiration time for the file lock. If Expiration is empty, the file lock will never expire. Timestamps are formatted according to RFC 3339.
AllowDownloading specifies whether others should still be allowed to download the file while it's locked.