>I am interested in the ethics and common legalities of using your framework in more than one job. Perhaps you bought a framework, then modified and adapted it. Perhaps you work for a company at one time and are an independent consultant at another. Maybe on one contract you own the code, and on another one the client does. This problem hasn't come up for me yet because the different jobs I have had involved different languages, many of them obscure.
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>It seems to me that your framework is the body of your knowledge and experience, which you must bring to all your jobs. But it is also code, which most employers will not allow you to take home. How do people resolve it?

I would think that what you bring to the table before a job/contract starts can be taken with you when it is over or completed. Some of what you touch on may be considered "intellectual" property which always goes with you. Your framework should always be yours (IMHO). I believe the ethics are that you can not reveal, divulge or transfer information and business rules from one customer to another.

Some companies/customers may have same or similar practices and business rules. But once the customer defines what they need, it is your job to deliver what they need. You can not help if there are similarities between customers.