Defending patents
<disclaimer> I am not a lawyer and am not schooled in patent litigation. All knowledge gained from publishing my own software through my own software company to Fortune 500 companies; and dealing with their BS. </disclaimer>
There is no clause, but a good deal of precedential law that shows if you can't be bothered to defend your patent after a lengthy amount of time (and that means fililng court proceedings for infringement or "instigating licensing negotiations"), AFAIK 18 months, then it reflects very badly against you if you do go to court later.
This 18 month (?) timer starts from when you officially learn of the infringing product and resets if negotiations "break down" (SCO) and / or if the patent changes hands to "new ownership" (TI's patents sold to NS vs. Intel), such as MS selling from its OS operation to its IP Holding Trust or vice versa... hmmm...
Dealing with software patents is a huge pain. When we are supposed to be writting to STANDARDS that everyone must follow, it NECESSARILY limits the ways you can do something, even something that is "non-obvious".
The problem is not that new, innovative ways to do something are being patented (and royalties due), but that ways of doing things are being patented that are inefficient or have no utility and then having interpretaions shoehorned as Joe Freeman violating X's patent for "Textual and / or graphical display of salutation to existential and nonexistential observers through a virtual viewing aperature via a common electronic display unit"... ie. "Hello, World."
Because of the limitiations imposed by required standards that cannot / should not (looking at you RAMBUS!) be patented, there is little room for innovation to complete a specific "business method". Trying to impose a patent on breathing should(!) be thrown out without a thought - the same with patenting a way of doing business. If not, can I patent the process of charging customers for my services? If not, then why does it matter *how* they pay me(Visa patents...)?