Wrong. It is not theft. It is copying. Theft implies my ownership of something at the expense of another.

Example: Sparlings truck was stolen by a thief. If that thief has come up to Sparling's truck and assembled his own truck based off of Sparling's and it was alike in every way, would you say that he stole the truck? No, the truck was copied. The original truck is still there, and the use of my truck in no way impacts Sparling's truck.

This whole concept of "intellectual property" is nothing more than a caveat that gives the original owner the power of attorney.