If a work was registered during a period that required renewal (in the US, 1923-1963) but was not renewed, protection has expired and the work is in the public domain.
If a work is likely to be protected but the rightsholder cannot be identified or located, the material is considered an "orphan work." There is currently no law allowing the unlicensed use of orphan works: you can try for years to locate and contact the rightsholder, but if you use the material without their permission and they magically crawl out of the woodwork, you are as guilty of infringement as you would have been had you not attempted to contact them at all, and they can sue you for up to $150,000 per infringement even if real damages were nowhere near that.
The copyright holder, or anyone the copyright holder authorizes.
Use the latest copyright date.
You may use copyright protected material when you are the copyright holder, or when you have permission from the rightsholder or an exemption in the law. The most notable exemption is fair use or fair dealing, which allows certain limited unlicensed uses in situations such as education and commentary.
"The sailors abandoned the sinking ship." "His friends abandoned him when he got into trouble." "He discovered gold in an abandoned silver mine."
With permission from the copyright holder, yes.
Copyright gives the creator of a work control over its use. A license is a way the copyright owner can allow others to use the work.
license agreement
Websites are protected by copyright, so you would need permission from the copyright holder or an exemption in the law to use someone else's web content.
Contact the copyright owner, or his/her agent.
I had literally snatched the abandoned dog from the jaws of death. The abandoned car had no tires. The shipwreck was abandoned where she had foundered.
If your use would not be considered fair, ask the copyright holder for permission, in writing, and be specific.
I have not received a notice of copyright infringement related to the use of spectrum.