You may be that France has just voted a law against P2P piracy and is directly targeted.

It is not yet applicable, but this should not last long, unless the European Commission makes it obsolete.

I use Transmission for almost two years, but I'm still a novice in settings for individuals to protect themselves.
This law allows the authorities to go back to us using our IP address.
Can you tell me if it's possible what I can do to remain anonymous?
Thank you for your answers,
I'm french and I apologize if the translation is uncertain, because my English is not very good.