 :Hi Niall / , :There appears to be some consensus on that page that commercial links can be included (and there is nothing specifically against commercial links at the relevant guideline). However, the point of external links is to provide further information for the readers (they are even labelled as such in the Automatic number plate recognition article). Clearly in many cases, some of the larger commercial companies hold more extensive and authoritative information about the technology on their websites than can be included here. However I could not see that the link you inserted provided this additional information. The link appeared to have been inserted only to promote the company - and this is not what the links are for. I'd encourage you to study the external links guidelines and spam policies further - inserting links to your own company is especially frowned upon. Please understand this is not about the size of the companies or the profit they make, but the size of the information they offer in relation to what can be included in Wikipedia articles.    