Expression is the starting point.
Copyright protects original works of authorship fixed in a tangible form of expression. Photographs, writing, films, music and software are among the kinds of work discussed by the U.S. Copyright Office.
Ideas, procedures and systems are different from their particular expression. Start by identifying the actual work you are asking about.
Read the Copyright Office overview ↗Connect the work to its history.
Keep source files, publication dates, relevant agreements and permission records together. Ownership may involve work-for-hire arrangements, assignments or other transfers; a specific question needs its own context.
Use the official starting point.
The U.S. Copyright Office registration portal provides routes for different types of work and links to current application guidance. Check the relevant category and its current instructions.
Visit the registration portal ↗Bring the relevant terms.
If a license, agreement or permission is involved, keep the document and the correspondence with your notes. Identify the work, the use you found, and the terms you want clarified.
This guide gives general information. It does not resolve ownership, assess a defense or advise on a specific dispute.