Abstract: A method for doing business with barcodes is disclosed, The method includes the steps of: a) creating a barcode system having a one-dimensional (1D) barcode and a two-dimensional (2D) barcode corresponding to the 1D barcode, wherein the two barcodes reflect a single product made by a manufacture; b) using the 2D barcode to browse a website of the product by a customer; c) using the 1D barcode to make checkout by a dealer; d) after the step c), the customer using the 2D barcode to activate a registration, service and warranty; and e) using the 2D barcode to inform the customer a message about the product by the manufacture.

Abstract: A method for interactive false checking of a product by using colored 2 dimensional bar codes comprises the steps of (a) generating a unique colored forgery-proof bar code 40, a fixed data 41 and a 2D variable bar code 42 by inputting a product related data and generating a database in the auto-bi-directional comparison and the responding system 6; (b) printing a colored 2D variable bar code containing the product data by a digital printing device; (c) printing the colored 2D variable bar code on a tag; (d) a consumer scanning the 2 dimensional variable bar code so as to get the product data which transferred to the system for comparison; (e) after comparison, a comparison result being transferred to the consumer's handset; and (f) the phone numbers of the phone or handset of the consumer for future using. A system for performing the same is also provided.

Abstract: A method for selling genuine goods by a barcode and network is disclosed. The method includes the steps of: a) generating a barcode for a product; b) attaching the barcode on the product and registering the barcode and the product in a server; c) a retailer updating the server to render the product sellable by reading and sending the barcode; d) a customer reading the barcode and sending to the server for verifying the product; e) the server answering if the product is genuine or not; f) informing the customer not to buy the product when the product is not genuine; g) informing the customer the product is OK when the product is genuine; and h) the retailer updating the server to render the product unsellable when the product has been sold.