Final answer:
Suits for infringement of copyrights and patent rights must be defended through legal proceedings. Fair use can be asserted in copyright cases, while patents can be invalidated by proving they do not meet the requirements for patentability.
Step-by-step explanation:
Suits for infringement of copyrights and patent rights must be defended through legal proceedings. In copyright cases, the defendant can defend themselves by asserting fair use, which allows limited use of copyrighted material without permission from the copyright owner. In patent cases, the defendant can invalidate the patent by proving that it does not meet the requirements for patentability, such as lack of novelty or non-obviousness.