In Germany, for instance, if you fail to advertise important clauses correctly, the contract may void. This is often applied in cases like "download sites" whic

In Germany, for instance, if you fail to advertise important clauses correctly, the contract may void. This is often applied in cases like "download sites" which allow you to download Firefox and likes for free - but in the contract you sign up for some kind of subscription for 4.99 Euros a month. Edit: abonnement -> subscription, thanks to @taejo.