Securely delete files. SubRosaSoft Shredder allows you to delete files from your computer in a secure fashion making it impossible for anyone to retrieve. Much like the common office shredder, it will take any data you drag into it and turn it to pulp. Technically, this process is achieved by writing an industry recognized secure pattern over the entire contents of the file, changing the relevant directory information, and then instructing the operating system to remove the remnants.