Read your contract agreement. If you don't have a written agreement, the freelancer owns the copyright of the works, at least under US law since 1976.
Under the US copyright law, unless you are an employee (which would not be "freelance"), you are considered the legal author of your works (and thus, automatically, the owner of the copyright), provided there is not a valid written agreement stating otherwise.
That agreement for a "work made for hire" is ONLY valid if the work falls under one or more of the nine (9) defined categories of works, listed below. Any other type of commissioned work is not and cannot be a "work made for hire". The only possible way for the client to obtain the copyright would be a separate, written "transfer" agreement in which the freelance author assigns the copyright ownership to the client.
Here are the statutory categories for a non-employee "work made for hire":
"a work specially ordered or commissioned for use
if the parties expressly agree in a written instrument signed by them that the work shall be considered a work made for hire." 17 USC § 101 [numbers added]
Note that "new computer program" is nowhere in the list, meaning they cannot possibly be commissioned as "works made for hire".
Unless other agreements have been made, the creator generally owns the copyright.
This should be addressed in the contract.
rock around the clock
Unless other arrangements are made, the creator of a work controls the copyright.
Legally, the author of any work owns the copyright until they transfer it to others or it is transferred by law (such as inheritance).
Unless other arrangements are made, the creator of the work is the automatic copyright holder.
The creator of a work generally owns the copyright unless other arrangements were made. But a single thing can have many rightsholders.
Many are handled by Black Star (link below).
All works of William Morris are in the public domain.
Nobody owns the copyright of a single word. Perhaps you mean trademark.
the coca cola company owns the copyright
Completed in 1894, the work is in the public domain.
Unless other arrangements are made, the creator of the work is automatically its copyright holder. Ownership can be transferred by contract, or can be inherited. However, transfer of a copyright is far less common than licensing of the copyright.
A minor owns the copyright on any works they create.
The role of any freelance writer is to ensure that he or she writes a unique, informative, concise, and grammatically correct copy that will be required by the client. The freelance writer is also bound to follow the rules of copyright and make sure to submit works that are not plagiarized.