<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How long is a copyright valid? Context: Copyright is valid for the lifetime of the author plus 70 years. Answer: [/INST]Copyright is valid for the lifetime of the author plus 70 years.</s>