This is exactly what Acacia are planning on, enough webmasters get scared by a letter, then all rush to sign up so Acacia can continue to finance the fight in court. Acacia are so desperate to raise money they are down to cold calling on the phone by guys who do not know what they are doing.
Every $ you give to Acacia contributes towards screwing your fellow webmasters. Every licensee is giving to screw the rest of you. I say you because I will just roll up the drawerbridge and let them sue me here in Europe.
How much have you given to
IMPA or
Fight The Patent? These are the guys that are taking the fight to Acacia.
Eventually the patent will get turned over and by us in the porn business, waiting for Microsoft to come in and save us is like waiting for hell to freeze over. But every one who signs up will just make it mor expensive for those that are left to fight alone.
Ignore it until you get a summons and do not think signing up saves you from anything. Unless you get a cast iron deal that rolls on for years, they will bleed you dry to fund the fight. This year 2%, next year 5% and the year after? Who knows, not even Ryan and Berman themselves will tell you.