If you need DOS printing capabilities but cannot (or will not) pay for DOSPRN 20, you have three legitimate alternatives.
The search volume for "dosprn 20 registration key verified" spikes on weekends (when IT admins work overtime) and declines on paydays. This suggests that people hunt for cracks when their company refuses to reimburse small software purchases.
: Open the DOSPRN properties window and click the "Registration" button. A unique number will appear in the "Code" field.