Disconsented
We are working off two different meanings of theft here, I am going to go with the one I have heard used by a district court judge during a police report.
Theft is the illegal taking of another person's property without that person's permission or consent
Property can be tangible or intangible, in this case intellectual.
Which changes nothing. Taking something means removing it from the supply, from its proper owner.
It is not possible to "take" intellectual property unless you remove someone's brain matter, or deprive them of their monopoly right.
Disconsented
The act is taking,
The intention is knowing what you are taking,
It is prohibited by and amendment within the crimes act. (Not entirely sure where)
In the United States, it's prohibited at the state level. Each state has its own statutes forbidding theft. The Codes of Federal Regulations include only a provision that forbids theft of government property.
Copyright is primarily a set of Federal rules, and secondarily of the States.
I don't know where you live, so I can't comment on this so-called "crimes act." (Particularly since it is not relevant to discussions on Gaia, which are covered by US Federal and California State laws.)
Disconsented
That would be theft only if copyright infringement wasn't a criminal offense.
It isn't. It's a Tort Law, not Criminal Law. That is, it's a civil offense, not a criminal one.
It becomes a criminal offense only when the motivation is to sell the illicit copies or, under the Stop Online Piracy Act (or its sibling, PROTECT IP), a felony to stream or make available. Since that bill has not passed yet, it is not a crime to do any of those things. It is a crime only to produce and disseminate forgeries of US Government symbols or seals, or to produce or sell software or devices that can circumvent Copyright protections. It can also be a crime to sell copies of Copyrighted works, given enough volume.
But it is not a crime to merely infringe. It never was.
You can get the pants sued off of you, but you can't go to prison for it. (Yet.)
Disconsented
So the case is probably, one of us has missed something, in which case it is usually me or the difference in international law is great enough for this to be happening.
No, the case seems to be that you don't understand Copyright law. (And not very many people do.)