Does copyright apply to contracts?

It depends on the type of contract. A contract written from scratch may be eligible for copyright protection. But, a contract made from a pre-existing template with only a few details changed here and there will not be eligible for protection.

Copyright Law Firm in Vietnam

Coming to your question, it depends on who is the actual author of the contract. If you wrote the contract and are not bound by any confidentiality clause, you can go ahead and use it for your own purposes (including distribution).

Even if someone else wrote it, the answer will remain more or less similar. A contract signed by you can be used for your own purposes but you cannot claim copyright in that contract.

If you use and distribute a contract written by someone else claiming it as your own, it will be a case of violation of copyright.