Provided that (svo framarlega sem)

To say "provided that" or "as long as" when setting strict guidelines or rules, use the formal conjunction svo framarlega sem.

Like ef (if), but stronger, it emphasizes that an outcome is entirely dependent on a condition being met.

You are eligible provided that you pay the membership fee.
Þú ert gjaldgengur svo framarlega sem þú borgar félagsgjaldið.
The rules are binding provided that everyone accepts them.
Reglurnar eru bindandi svo framarlega sem allir samþykkja þær.

Enforcing the Rules

Laying down the law requires firm vocabulary like viðurlögin (the penalties), undantekningin (the exception), and tafalaust (immediately). Note that the verb að hlýða (to obey) requires its object to be in the dative case (e.g., hlýða reglunum).

He is eligible provided that he obeys the rules.
Hann er gjaldgengur svo framarlega sem hann hlýðir reglunum.
You avoid the penalties provided that you obey.
Þú sleppur við viðurlögin svo framarlega sem þú hlýðir.
We allow the exception provided that you pay the membership fee immediately.
Við leyfum undantekninguna svo framarlega sem þú borgar félagsgjaldið tafalaust.

Breaking the Rules

When conditions fail or leave no room for negotiation, terms like útilokuð (out of the question / excluded) and phrases like hvort sem ... eða ekki (whether ... or not) express absolutes.

The renewal is out of the question if you do not obey.
Endurnýjunin er útilokuð ef þú hlýðir ekki.
The penalties apply immediately whether you obey or not.
Viðurlögin gilda tafalaust hvort sem þú hlýðir eða ekki.