Read the rights grant
What has been sold, in what territory, on which platforms, for how it is defined, and what the rights holder kept.
Sport
A live event creates something valuable that lasts about as long as the event does. What is sold around it is layered: broadcast, streaming, clips, data, access, accreditation and the ability to be inside the venue at all. Most of what goes wrong is somebody taking one of those layers without buying it.
The most damaging is redistribution while it is happening. A feed taken by somebody entitled to receive it and passed on to people who are not, a stream appearing for the duration of a fixture, clips posted before the event has even finished. Live rights are time sensitive by nature, so the harm is complete before most processes can respond to it.
The second is access granted for one purpose and used for another. Accreditation is issued on terms. Material shot under it then appears in a commercial context the terms never covered, or footage taken from the stands is sold on, or a media partner publishes more than its agreement allowed. The dispute is usually with somebody the rights holder needs to keep working with, which shapes how it can be handled.
The third is a rights holder discovering where its control stops. Control at a venue is real and it is not unlimited. An organiser can decide who comes in and on what terms. It cannot control everything that happens outside the ground, everything said about the event, or every use anybody makes of the result.
The fourth is competing grants around the same fixture. A competition, a club, a team, an athlete and a sponsor all publishing content from one afternoon, each under a separate agreement, none of which was drafted with the others in view. Nobody is obviously in the wrong, and the arrangements simply do not fit together.
What is actually protected, and what is not. A broadcast is protected, a recording of it is protected, and the works used within it are protected. The event itself is a different matter, because a sporting contest is not ordinarily a work of the kind copyright was built for. That is why control at a venue rests as much on contract and on control of the premises as it does on copyright, and it explains a great deal about how rights in sport are structured.
Contract and access carry most of the weight. Entry is granted on terms, and those terms are where the control lives. Conditions of entry, ticket terms, accreditation conditions and venue rules decide what may be filmed, what may be transmitted, what may be sold and what may be brought in. They are only as good as the version people actually agreed to, and they are worth reading before a season rather than during an incident.
What can be done about redistribution, and how quickly. Removal at scale is possible, measures directed at live infringement have been available in appropriate cases, and behind an anonymous stream there is generally a much smaller number of sources than there are outlets. What is achievable depends on where the source sits and how the redistribution is organised, and that is worth establishing before deciding whether to act during an event or after it.
Clips, data and near live material are licensed separately, and whether an unlicensed use is actionable depends on what is being taken. A short clip, a statistic, an aggregation of results and a full retransmission are not the same problem and do not have the same answer. Getting that distinction right at the outset avoids sending a complaint that cannot be supported.
What has been sold, in what territory, on which platforms, for how it is defined, and what the rights holder kept.
Agreements covering a single fixture read against each other, so the clashes are found before a match day rather than on one.
Unauthorised streams and retransmission addressed at scale, and the source identified where it can be.
Conditions of entry and media accreditation written so they do the work they are later relied on to do.
The response agreed in advance, because the window during a live event is short and decisions taken inside it are rarely the best ones.
A real name and address behind an anonymous operation, obtained lawfully and usable afterwards.
A supporter posting a clip from a phone is not the problem, and pursuing supporters costs more goodwill than the clip is worth. The problem is organised redistribution: the operations carrying a whole fixture, the subscription services built on somebody else's feed, and the accounts that exist for no other purpose. Concentrating on those and tolerating the rest is not a weak position. It is the only one that works.
Once an event has finished, most of the value in the live rights has already gone. Pursuing an isolated breach at that point is sometimes right, where it establishes a position for the following season, and it is frequently just an expense. That is a decision worth taking deliberately rather than by reflex.
Positions harden the moment the other side takes advice, and the quiet routes stop being available once a demand has gone out. While nothing has been sent, everything is still open.