After installing many windows updates using WSUS Offline update tool folder have been created in local disk. Folder have small lock icon at left bottom part, and are named with numbers and letters e. g.:
5c888307b467c6cbdbcf0e7a0e
9a28dfb6f9707111e6312d
68b2e7c350ef601175
etc.
What are these used for? Are they safe to be deleted?