The UK is a signatory to the Berne convention.英国是伯尔尼公约的签署国。The document must be signed by an authorized signatory of the company.这份文件必须由该公司授权的签字人签署。Their job is to check that none of the signatory countries is cheating on the agreement.他们的工作就是进行检查，确保所有签约国遵守协议。