Who are "we" and under what circumstances was this written?
As I was recently reminded (long story), of the fact that in New York State there are three classes of employee. One is a contract employee. Unless the contract says otherwise, any work produced for your contract is a work for hire and is owned by the customer. Published articles often take this form. The second type is an hourly employee. Anything you do doing work hours is owned by your employer. If you are not paid by piecework and you don't see a timeclock, then you are a professional employee. Whether or not you realize it, everything you do your employer has first claim on. (A lot of people are professional employees but don't realize this. Friends tell me that the resulting legal issues have yet to be properly considered by the open source community...)
So if you are a consultant and your contracts aren't clear about it, you likely don't have any rights to the work you did. For details, talk to a lawyer, which I am not.