Basically, an entreprenuer who has built his business with a particular viewpoint on social issues or responsibilities, can have this incorporated into the company charter, so any future buyer of the business has to adopt them.
Guess this is where liberal tree hugging and cold business collide head on

Wonder if we will see anything like that in the UK over the next few years? I can see some benefits, we for example have always pledged to help our local Air Ambulance. It would be nice if Yell came along and bought us for tuppence hapenny that they would continue to honour any pledges we had made going forward.
Source:
New Legal Protections for Social Entrepreneurs - BusinessWeek