<img src="https://publish-01.obsidian.md/access/744ac39d33cabbc297b91373bfcac24d/bin/images/Bulgaria_map.png" alt="Bulgaria" class="page-header-sidebar-image"> Bulgaria has provisions in its legislation relating to the granting of compulsory licences. These can be found in Art. 32 of the Law of Patents and Utility Models Registration. Arts. 32 and 32a LoP provide for the grant of a compulsory licence under the following specific circumstances: (1) The claimant has unsuccessfully tried to obtain a contractual licence from the patentee under fair conditions and at least one of the following conditions is met: • the invention has not been exploited for a period of four years from the date of filing of the patent application or three years from the grant of the patent, the later term being applicable, or • within the time limits set out above the invention has not been put to sufficient use to satisfy the needs of the national market, unless the patent owner proves valid reasons thereof. (2) The compulsory licence is of public interest, even if negotiations with the right owner over the patented invention have not been conducted. (3) The invention is part of the subject matter of a later patent and is included in the scope of another, earlier patent, when the owner of the earlier patent refuses to grant a licence under fair conditions, and where the subject matter of the later patent represents a significant technical progress of great economic importance compared to the subject matter of the earlier patent. (4) When a plant breeder cannot obtain or use the right in a plant variety without infringing an earlier patent and insofar as the licence is required for using the plant variety for the purposes of its legal protection, or when the owner of a patent for a biotechnological invention cannot use it without infringing an earlier plant variety right, provided that the breeder or the owner of a patent for a biotechnological invention proves that he has tried unsuccessfully to get a contractual licence from the patent or plant variety owner, and the plant variety or the invention represents a significant technical progress of great economic importance, compared to the patented invention or the protected plant variety.  More information can be found [here](https://e-courses.epo.org/wbts_int/CompulsoryLicensing/CL_BG.pdf).