Under current copyright law it is unlawful to do various things aimed at circumventing effective technological measures that restrict access to copyrighted material, even if doing so is required for lawful use. This includes both civil liabilities and criminal offences. In the event that such a “technological measure” prevents permitted acts (i.e. what could be lawfully done anyway), the only current remedy is to apply to the Secretary of State for a permit.
The Pirate Party seeks to abolish these laws, making it legal both to circumvent “effective technological measures” and produce, distribute and possess tools to aid in doing so. This would not change existing copyright, law, merely remove the extra layer of illegality.