Please review the corrected text:
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Definition of Contract Labour
Please have a look at the definition of contract labour given in the act. It refers to any person who is working on your premises because you have a contract with their actual employer to deliver certain services other than the sale of a product.
So, there is nothing in the rules that says labour is manual work or anything to do with the factory. Every person who is on a contract, irrespective of the work they're doing, including highly skilled engineering people, is covered.
So, you need to register, and the contractor needs to get a license.