With a DIN P-4 security level, you can shred personal documents into irreparable pieces. Lawyers and notaries often have a paper shredder with at least a DIN P-4 safety level. This is due to the GDPR legislation. This states that companies and companies must securely destroy the personal data of customers. DIN P-4 shredders turns a sheet of A4 paper into at least 421 shreds. There are also paper shredders with a P-4 level that shred one sheet into 1,200 mini shreds.