Attribution is very simple to add to your writing and protects your reputation, your integrity and your job prospects.
A white paper is similar to a research paper, requires correct attribution and should provide the reader with a guide or a how to on the subject matter of the white paper.
Without proper attribution, it steals the ideas, the work and the efforts of another writer and declares them your own.
Remember, attribution takes less than a sentence, but accusations of plagiarism can't be undone with hundreds of sentences.
This may be as simple as asking for attribution, specifying non-commercial use, or something else.