As noted here (see also here, here, here),
Texas Instruments has issued a DMCA notice to United TI, a group of enthusiasts. They had been cracking the keys that sign the operating system binaries in an attempt to gain access and possibly expand on the features.
Suing your own most dedicated fans of your increasingly outmoded device (its calculators), for trying to modify it to make it more useful to them. It's hard to decide what's more ridiculous: IP law, or the way companies use them.
