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).
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.
Assuming the software meets the criteria for copyright protection ("a work of sufficient originality fixed in a tangible medium perceptible by human or machine") the author of the software, or in the case of work-for-hire, the company the program was created for would hold the copyright.
It depends on who owns the trademark (you or someone else), the nature of the copyrighted work, and how you're using the trademark in the work.
Nobody owns copyright of music written two hundred years ago. The copyright of anything published before 1923 is irrelevant as it has expired. Copyright in an unpublished work would also expire according to the laws of the country in which it was created. For comparison, in the USA, an old work previously unpublished but recently issued would have a copyright that does not expire until 2047.
Mr. Sharpsteen's estate may control the copyright for some of his works, but anything created as a work-for-hire for Disney would be controlled by Disney.
The creator of the image, unless other arrangements were made. In UK there is a copyright law called "First players copyright" this essentially says if you created a unique piece of work (Picture, photo, book etc) then you own the copyright and you dont have to apply for that.