>If you don't reply in some reasonable amount of time (say three months), then the copyright is considered abandoned and the work enters the public domain.

I'm not sure why I'm legally required to respond to requests for the use of my copyrighted works. I can simply ignore them. Requiring that I respond to them will create an undue burden on me.

I don't mind as long as I can bill you personally for forcing me to hire someone to respond to such requests, at a reasonable rate for a legal attorney with a specialty in copyright. He can even provide invoices, although the time required to produce the invoice will be included in the invoice.