As with many things, there are varying opinions on how to develop effective keywords and individual page descriptions.
Looking at things from a reverse planning approach, it is important to think first about the strength of your websites content.
Search engines want to see content that is “natural”. Many search engine robots are developed to look for “Spun Content” and disregard it when indexing a website.
In school, we were taught that Plagiarism is wrong. Search robots are developed in the same way. Either way, if you get caught, you fail. Websites can be de-indexed or blacklisted.