Unpaid seller rights: lien, stoppage in transit and withholding delivery protect sellers against nonpayment and buyer insolvency. The unpaid seller retains a lien on goods while in possession, a stoppage in transit right to intercept goods after parting with possession upon the buyer's insolvency, and a limited right of re-sale under the Act. If property has not passed, the unpaid seller also has a right of withholding delivery co-extensive with lien and stoppage in transit rights.