How many licenses should I buy?

BarcodeNET include three components .

If you buy 1 developer's license then you can distribute BarcodeNET/Windows free without limit. And deploy BacodeNET/Image,BarcodeNET/HTML in one website.

The best deal is BarcodeNET enterprise edition; you can use BarcodeNET with no limit on the number of developers and no web site limit.

How to improve the quality of barcode?

BarcodeNET 7 promotes new properties "MeasureUnit","ImageDpi".
The default MeasureUnit is PIXEL. In this mode, you will get smallest image size and best result on the display. But when printing, The text quality will not be good. When setting MeasureUnit to POINT, and set ImageDpi to 300 or 600. The barcode image will be much better.
Generally speaking, if you are concerned with performance, then set MeasureUnit to PIXEL mode. If you would like better quality, then set it to POINT mode

How do I resize the image?

Set "BarWidth" and "BarHeight", developer needn't care about output image size. BarcodeNET will automatic resize it depend on actual barcode width.
In BarcodeNET 7 , we promote another property "WebImageScale", when you set the value to 0.8 ,the image size will be 80% of original size.