Points To Remember
It is both illegal and unethical to knowingly infringe on what you understand to be a valid patent.
It is unethical to make claims in a patent application when you know there is prior art that would invalidate the claim.
It is unethical to use what you know to be false claims of patent infringement in an attempt to intimidate competitors.
It is both unethical and illegal to knowingly infringe on a valid copyright. This includes making copies of copyrighted software products.