The phrase "are often protected" is correct and usable in written English.
It can be used when discussing subjects or entities that typically receive some form of safeguarding or defense.
Example: "Endangered species are often protected by law to ensure their survival."
Alternatives: "are frequently safeguarded" or "are commonly defended".
Insect eggs are often protected from desiccation by parentally derived gels, casings, or cocoons, but active parental protection of offspring from desiccation has never been demonstrated.
Domestic industries, by contrast, are often protected from competition.
State activities are often protected by legal prohibitions on competing private enterprise.
Hardcover books are often protected by a coated paper jacket (or dust jacket)." Useful information for the man from Mars.
They are often protected because they call themselves 'satire' or say in tiny fine print that they are for entertainment purposes only".
Critics, however, say the American aid does indirectly contribute to the army's counterinsurgency efforts, since coca fields and drug processing laboratories are often protected by the rebels.
And because Western convoys run by private security companies are often protecting senior American civilian and military officials, the Iraqi government's struggle with the companies has in some cases become a sort of proxy tug-of-war with the United States.
Seals were often protected by woven bags or by boxes of wood, metal, or ivory known as skippets.
The gateway was often protected by a barbican a walled outwork in front of the gate and the passage through the gateway was defended by portcullises, doors, and machicolations.
Even if they were public, many companies worried very little about the price of their shares and were often protected from hostile takeovers by a network of long-term cross-holdings with banks and other industrial companies.
Reinhardt – a Roma who remained in France through the war years but was often protected from Nazi persecution by closet jazz fans among the invaders – kept on playing some of the most life-affirming and generous music of the decade.
