Generally, it is not allowed to distribute/copy ( in any form ) the past SAT papers without the permission of CB. And CB makes sure that the past papers aren't distributed ( or leaked) because the experimental section has yet to be appeared as the actual testing section...
If you get any past paper in any form, it surely is illegal, until CB is the one providing you the papers.....
But there are a lot of students ( I think almost everyone) , who have practiced the actual SAT papers... I have done too...
It's your choice what you want to do...
Also, this is the not the right place to ask this question..
You will get varied answers and you will certainly know more about this this topic, if you make this thread or similar to this, here:
SAT Preparation - College Confidential 
