Why does my SQL Server database always become read-only after attaching the database?

Source: Internet
Author: User
I copy a database from my classmates, it can be used in his, but when I attach to my own SQL Server, the database appears read-only, I have seen the database source files in the same folder as normal! Please expert advice! Thank you

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You have to change the properties of the database file right-click on the properties of two files--security--add--Find now--find everyone this user
Put his authority on the hook, make sure it's okay.
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