The document discusses patent infringement, including what constitutes infringement, exceptions, defenses, and remedies. Direct infringement occurs when an invention claimed in a valid patent is made, used, sold, or imported without authorization. Exceptions to infringement include research/experimental use and activities reasonably related to FDA approval. Defenses include invalidity of the patent, inequitable conduct, and improper inventorship. Remedies for infringement include injunctions and damages, with enhanced damages possible for exceptional cases.