If you don't have time for a half hour of reading on the TPPA, get the skinny here in less than three minutes.

Don't get how the TPPA will it actually affect our everyday lives? In the fifth of a five-part series, we look at how it affects the New Zealand music industry.

Lorde fans, fear not, your album collection won't really be affected by the TPPA.

Well, not for another 50 years.

Lorde's copyright will extend another 20 years.

The trade agreement extends copyright from 50 to 70 years, so money paid for royalties and licenses will have to keep rolling in to copyright holders for a couple more decades.

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It's estimated that change will eventually cost consumers about $55 million per year (over a "long term" including the initial 20-year period), according to the Government. This covers foregone savings on books, films, music and other works.

However, Retail NZ general manager of public affairs Greg Harford said the cost was unlikely to hurt your wallet.

"Any impact will be pretty marginal," he says.

"If you look at the price for older music now, music from the 60's or 70's, it's pretty well-priced and it's not significantly different to stuff that's even older than that and outside the copyright period."

That's because new music is priced at a premium when it's released, and then declines and flattens out with time as demand falls away.

So it won't really cost Joe Bloggs any more to buy music. What if I'm an aspiring musician?

Then this deal is great for you, says Recorded Music CEO Damian Vaughan.

The law change would be "in line with every other Western nation on earth that has copyright".

"People we represent, record labels and recording artists are on equal footing in the world," Vaughan said.

However, the government has a complicated "phase-in" period of extending copyright to 60 years, before deciding to change it 70 years - which makes it "administratively burdensome".

How does copyright for recorded music work?

There are two copyrights when a song is recorded: one belongs to the person who wrote the song. Royals was written by Ella Yelich-O'Connor (Lorde) and Joel Little. That means their rights at the moment will last throughout their lifetime, and then another 50 years.

The other copyright is for the recording - which in this example would belong to Lorde's record company Universal. That goes for 50 years after the recording.

In the first stage of implementing the TPPA change, copyright will move to 60 years, and then the government has eight years to decide when they will move it up to 70.

The "cost" the government has predicted is seen as a "benefit" by copyright administrator Recorded Music.