If a work does not have a copyright notice (or © symbol), is it protected by copyright?

Most likely. Copyright protection exists as soon as a work is created. Under Canadian copyright law, the work does not need to be registered and the symbol © is not required to appear on the work. There may not even be any reference to copyright protection. It is not necessary but it is possible for the work to be registered under a voluntary government registration system, such as with the Canadian Intellectual Property Office (CIPO). Copyright does expire, however, after which the work is no longer protected regardless of any copyright notice or symbol.

Other countries have different laws and regulations which govern copyright protection, but due to international treaties most countries offer similar protection. Works created in most other countries are protected in Canada under Canadian copyright law.