Validity of licence: licences remain valid until revoked under law but become invalid after prolonged inactivity. A licence under the Customs house agents and customs brokers licensing regulations remains valid unless and until revoked under the revocation provisions of sub regulation (2) of regulation 8A or regulation 14; additionally, a licence is deemed invalid if the licensee is inactive for a continuous period of one year, creating both procedural revocation and inactivity based invalidation mechanisms.