Act to restrict reproduction? (4-6,3)

I believe the answer is:

anti-piracy law

I'm a little stuck... Click here to teach me more about this clue!

'restrict reproduction?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'act' is the wordplay.
I cannot really understand how this works, but
'act' could be 'piracy' (piracy is a kind of act) and 'piracy' is found within the answer.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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