Software for protecting the data cd



hello guys…

      I am very new to this. And i searched this forum for my solution but it doesn't help me. So please help me. Here is my problem...

       i had spend lot of time on internet and i downloaded many softwares for my mobile and i write it on the disk. but i am not capapable to protect the software . Some times my friends were copied my data. So please give a solution,. How to protect the cd with the lock facility even it won't for copying . 

    Is there any software for protecting the data disk.

Please help me… Thank you inadvance (sorry for my poor english :D)