Odgovornost vrijedi u mjeri u kojoj je ugovorena.

Not here. The verb vrijediti can mean to be worth, but in formal and legal language it very often means to be valid, to apply, or to hold.

So in this sentence, Odgovornost vrijedi... means something like Liability applies... or Liability is valid..., not Liability is worth....

It does sound repetitive if you translate word by word, but this is a normal Croatian structure.

• u mjeri = to the extent / in the measure
• u kojoj = in which / to which extent

Together, u mjeri u kojoj means to the extent that or insofar as.

This kind of doubling is common in Croatian relative structures. A fuller version could be:

u onoj mjeri u kojoj... = to that extent in which...

But onoj is often left out because it is understood.

Mjeri is in the locative singular.

That is because it follows the preposition u, and here u means something like in or within, not movement into. With this kind of meaning, u takes the locative.

So:

• u mjeri = in the extent / to the extent
• not u mjeru, which would suggest movement and would not fit this expression

This is part of the fixed phrase u mjeri u kojoj.

Kojoj is a form of the relative pronoun koji, and it refers back to mjeri.

Since mjera is:

• feminine
• singular
• here in the locative

the relative pronoun has to match it:

• mjeri → feminine singular locative
• kojoj → feminine singular locative

So u kojoj literally means in which, referring to the extent.

Because it agrees with odgovornost, which is a feminine singular noun.

• odgovornost = feminine singular
• ugovorena = feminine singular form

Croatian participles and adjectives agree with the noun they describe.

So the sentence is structured so that ugovorena refers back to odgovornost, even though odgovornost is not repeated in the second part.

Je ugovorena is built from:

• je = is / has been
• ugovorena = passive participle of ugovoriti

In this sentence, it means something like:

• is agreed
• has been agreed
• is stipulated in a contract

In legal language, ugovoriti often means to stipulate by contract or to contractually agree.

So u kojoj je ugovorena means to the extent to which it has been contractually agreed.

Because Croatian often leaves out pronouns when the meaning is already clear from the context.

Here, ugovorena is feminine singular, so it already points back to odgovornost. Adding ona would usually be unnecessary.

So Croatian naturally says:

u kojoj je ugovorena

rather than:

u kojoj je ona ugovorena

English often needs an explicit subject, but Croatian often does not.

Not exactly.

• dogovorena comes from dogovoriti and means agreed, in a general sense
• ugovorena comes from ugovoriti and usually has a more formal or contractual meaning: agreed by contract, stipulated, contracted

In legal or business language, ugovorena is the better choice here because the sentence is about something that has been formally agreed.

Because Croatian has no articles.

English distinguishes between:

• responsibility
• the responsibility
• a responsibility

Croatian normally uses context to show that difference. So odgovornost can mean responsibility, the responsibility, or sometimes even liability, depending on context.

That is completely normal in Croatian.

Croatian word order is more flexible than English word order, but this version is the most natural and neutral for formal writing.

Odgovornost vrijedi u mjeri u kojoj je ugovorena.

puts the topic first:

• Odgovornost = what the sentence is about
• vrijedi = what is being said about it

You might see small variations in emphasis, but in legal or formal style this order is very standard and clear.

Yes. Several things make it sound formal and legal:

• odgovornost often means liability in legal contexts
• vrijedi in the sense applies / is valid is formal
• u mjeri u kojoj is a typical formal structure
• ugovorena suggests something contractually stipulated

In everyday speech, people would usually say the same idea more simply. This sentence sounds like something from a contract, statute, or official document.