Hopefully we don't get DMCA style handcuffs! But even in the DMCA there are limitations which basically say that even though decrypting software (creation/use of) is illegal, you can only be prosecuted if someone is actually being harmed or damaged financially by it, i.e. making copies and distributing, etc.
What you should be concerned about is our copyright laws, as long as you're playing legally owned content on your PC, you'll be fine. If you're not, then why worry about what player it is anyway...