Registration validity: deemed invalidation for inactivity permits renewal within specified period upon fee payment and eligibility. Amendments add Regulation 10A allowing surrender of registration by written application to the granting Principal Commissioner/Commissioner and permitting revocation only after satisfaction that all dues are paid and no proceedings are pending. Regulation 10B deems a registration invalid if the Authorised Courier is inactive for one continuous year, permits renewal within ninety days by filing Form A1 with a prescribed fee, and authorises renewal only after satisfaction regarding performance, complaints, compliance with regulation 13, and eligibility under regulation 10.