Firmware won't change the rules unless some lawyer gets really frisky. You bought the device before the change and a firmware change like that would lead the lawsuits and full refunds on old equipment. New devices will all have this restriction. They go by original manufacture date I think so an old line that hasn't changed may not.
Strothgar, do the TV's have an output? You may have been able to take the feed from one to the other? However as was said above dual HDMI isn't a problem as you can legally use a splitter as long as it supports HDCP and both TVs do as well. A roku1 may work better as well. I'd hate for the kids to have a crappy picture but I'm a video snob at times.
One sidenote but the DMCA makes it illegal to circumvent copy protection for any reason. Hence you can have ripped copies of your discs but you can't make them to have them. They just have to magically appear. One could argue that signal converters that strip the HDCP or convert it to analoug which doesn't support HDCP are technically breaking the law. Hollywood really needs to be reigned in. I get the reasoning but they are turning honest people like Strothgar in what they technically consider pirates. What's next?
Nun sacciu, nun vidi, nun ceru e si ceru durmiv.
I know nothing, I see nothing, I wasn't there,
and if I was there, I was asleep.