In the next Beta patch, Legacy items (or items that drop prior to Patch 2.0.1) will no longer be able to be enchanted. This was a decision we ultimately made because certain Legacy items, when enchanted, became disproportionately strong compared to new items, which isn't the intent.
http://us.battle.net/d3/en/forum/topic/ ... ?page=2#36
Me da que las ideas que teníamos muchos de poder encantar algunos legendarios que teníamos o que alguno estaba guardando en el cofre para poder encantar, se van al traste.