II. Legal framework
18The EPO has published a booklet "National measures accompanying the implementation of the Unitary Patent". It provides a concise overview of the most important national measures accompanying the implementation of the Unitary Patent in the participating Member States having ratified the UPCA. It allows the relevant information to be easily retrieved country by country. It provides in particular information as to whether a so-called safety-net has been implemented in the relevant participating Member State. The safety net is a mechanism providing the possibility to validate a European patent where a request for unitary effect has been rejected either by the EPO or the UPC, or where the unitary effect has been revoked by the UPC at the time when deadlines for validating the European patent have already expired. Moreover, information is provided on whether simultaneous protection is allowed for an invention covered by, on the one hand, a European patent with unitary effect or a classic European patent and, on the other hand, a national patent.