Statement of originality samples for portfolios can be found at the websites of Ryerson University, Western Technical College and Clarke University. It is also referred to as a statement of originality and confidentiality. A sample for a thesis can be found at the University of Amsterdam's website.
Each portfolio sample states the ownership and confidentiality of the work and to not copy without permission. If the work comes from an employee at a company, it is noted that the company owns the work. The thesis sample states that the work is the original product of the author and that no unattributed sources exist for the paper.