2) Some companies insist on exclusive rights, and we charge them
       more for this privilege.

What happens to library and "reusable" code when the customer demands
exclusive rights?  Presumably pre-existing libraries and code aren't
covered.  What about brand new code developed as part of the project?  (Say
you need to write serial-dataflash routines for the first time.)  What
about code developed based on internal information from the company? (ie
code for read a non-standard GPS receiver or somesuch.)

BillW