Maybe you don't like your mobile phone carrier, but you like your phone and you want to keep it but change providers. An obscure change in federal law makes it illegal to switch without permission from your carrier.
If you have, for example, AT&T, in order to switch to T-Mobile you have to unlock the phone, and AT&T can now stop you from doing that.
The change in the copyright law has some people upset, and they're petitioning the White House for a fix.