nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqy8hwumn8ghj7mn0wd68ytnddaksqgqmcu9qzj9n7vtd5vl78jyly037wxkyl7vcqflvwy4eqhxjfa4yzyr2p7gd nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqy08wumn8ghj7mn0wd68yttjv4kxz7fwv3jhyettwfhhxuewd4jsqgplwuxkt5a8vj5utj6s8tsj8e3wcavc45p4mqmw92qs7wrh5azmys9f0hy6 nostr:nprofile1qy88wumn8ghj7mn0wvhxcmmv9uq32amnwvaz7tmjv4kxz7fwv3sk6atn9e5k7tcqyqt79zylhgqsy8gy3gfl6zappzknrsuryc54gcxzre5ug0agl0j32r5td2a

Let's add "licence" and "licence_url" tags similar to "language" and "explict" to allow artists properly release their tracks following CC and copyright standards.

See https://nostrhub.io/naddr1qvzqqqrcvypzqx78pgq53vlnzmdr8l3u38eru0n3438lnxqz0mr39wg9e5j0dfq3qyt8wumn8ghj7un9d3shjtnwdaehgu3wvfskueqqp3kh2umfvvkhgunpvd4hx62pzs3