a phrase used to show

[GoldfishLord]

all rights reserved

LAW
a phrase used to show that a particular person or particular people own the rights to a book, film, etc.

Source: https://dictionary.cambridge.org/us/dictionary/english/right

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Does "to show" mean "when you show"?

 

[Skrej]

No. It means something more like 'to indicate' or 'to declare'.

 

[GoldfishLord]

I'd like to ask one more question.
What's the subject of "show"?

 

[5jj]

As an infinitive form, it has no subject as such.

 

[emsr2d2]

I'd like to ask one more question.
What's the subject of "show"?

Everyone. Anyone. People. Whoever it is who's writing the words "All rights reserved".

(Cross-posted with 5jj, whose (better) answer is based on grammar rather than on usage as mine is)

 

[Barque]

Does "to show" mean "when you show"?

It means "in order to show" or "for the purpose of showing".

This is the purpose:

that a particular person or particular people own the rights to a book, film,

 

[Tdol]

Does "to show" mean "when you show"?

You have to include the phrase- you'll see it in the credits for films and in books before the text starts usually. If you don't make this statement/claim, then other people will feel free to copy the work without payment.