In 1984, when I was 13, I wrote an article on revising the AD&D combat tables, sent it in to Dragon magazine, and it was published the following year. Before it hit print, I was given a contract to read and sign. The contract specified that I was selling "first serial rights" only, and retained all rights for republishing, putting in anthologies, etc.
I signed the contract, and got a $100 check.
20 years later, Dragon released a CD-ROM compendium of all content. My article was included, without my permission.
This was not "initial" serial rights - this was a republishing.
I sent an email saying "you owe me additional payment".
They wrote back saying "no".
I filled out a small claims court form in MA, submitted it along with a $40 processing fee, and waited.
A few weeks later I was given a court date.
I showed up. The Hasbro magazine rep (Dragon was published by TSR, which had been acquired by Wizards of the Coast, which had been acquired by Hasbro) did not show.
I won the case by default.
The court mailed the judgement to Hasbro.
A month later Hasbro mailed me a check for $2,000, in accordance with the judgement.