Simplify the following text for a Grade 12 native English-speaking person.
Original: : Our policy : Primary sources that have been reliably published ( for example , by a university press or mainstream newspaper ) may be used in Wikipedia , but only with care , because it is easy to misuse them .
Simplified: : : Unless restricted by another policy , primary sources that have been reliably published may be used in Wikipedia , but only with care , because it is easy to misuse them .