Revisamos el uso no autorizado.

Because Spanish often drops subject pronouns when the verb ending already shows who is doing the action.

Here, revisamos already tells you the subject is we (nosotros/nosotras), so nosotros revisamos... is possible, but usually unnecessary unless you want emphasis or contrast.

It can mean either one.

Revisamos is ambiguous by itself:

• present tense: we review / we check
• preterite: we reviewed / we checked

This happens with many -ar verbs in the we form. Normally, context tells you which one is meant:

• Hoy revisamos... = probably present
• Ayer revisamos... = clearly past

Very often, yes.

In many contexts, revisar means:

• to check
• to inspect
• to review
• to look over

It does not always mean English revise in the sense of study again or edit/improve a text.

For example:

• revisar un documento = check/review a document
• repasar is often closer to go over again / revise for study

So an English speaker should be careful not to assume revisar always matches revise.

Here it is a noun: use.

You can tell because it comes after the article el and is followed by an adjective phrase:

• el uso no autorizado

It is true that uso can also be the I form of usar:

• yo uso = I use

But in this sentence, the structure clearly shows uso is a noun.

Spanish often uses the definite article where English may use either the or no article at all.

So el uso no autorizado can refer to:

• the unauthorized use, or
• unauthorized use as a concept/category, depending on context

This is very natural Spanish. English is often more willing to leave out the article, but Spanish usually prefers it in structures like this.

Because no autorizado is describing uso.

The phrase is built like this:

• el uso = the use
• no autorizado = unauthorized

So no belongs with autorizado, not with the main verb.

If you said no revisamos el uso autorizado, then no would negate the verb:

• we do not review the authorized use

That is a completely different meaning.

Because in Spanish, adjectives usually come after the noun, especially when they are descriptive or when they come from past participles like autorizado.

So:

• uso autorizado = authorized use
• uso no autorizado = unauthorized use

This is the normal order in Spanish. English often puts adjectives before the noun, but Spanish usually puts them after.

Because the adjective must agree with uso.

Uso is:

• masculine
• singular

So the adjective must also be:

• masculine singular → autorizado

If the noun changed, the adjective would change too:

• la actividad no autorizada
• los accesos no autorizados
• las copias no autorizadas

Yes, absolutely.

Both are natural, but the nuance is slightly different:

• el uso no autorizado = unauthorized use
• el uso sin autorización = use without authorization

The first is very common in formal, administrative, legal, and technical language. The second is also clear and natural, and may sound a little more explicit.

Not really. It is better to think of autorizado here as an adjective-like past participle modifying uso.

So:

• autorizado originally comes from the verb autorizar
• but in this sentence it functions like an adjective: authorized

That is why no autorizado works like a descriptive label attached to the noun.