In order to successfully create a valid 128 barcode, the information you are trying to barcode has to be encrypted, or the barcode reader will not be able to decipher the string of bars.

This tag is an algorithm that encrypts your string into a barcode-readable format.  You still need to use any Barcode 128 font in order to print it as a barcode.  This tag does not provide a font for you to use so you must locate your own.