Adds an option to only allow saving own books

README.md

@@ -137,6 +137,7 @@ The **_decrypt_** sign must have **\[Decrypt]** on its second line. The third li
 - Admin_Auto_Decrypt - Whether any admin can decrypt any book regardless of the group it was encrypted for
 - Author_Only_Copy - Whether to only allow the author of a book to create copies
 - Author_Only_Unsign - Whether to only allow the author of a book to unsign it
+- Author_Only_Save - Whether to only allow saving a player's own books with /savebook
 - Format_Book_After_Signing - Whether to automatically format every book when it's signed
 - Change_Generation_On_Copy - Whether to display "COPY" or "COPY_OF_COPY" instead of "ORIGINAL" when a book is copied.
   This also uses the vanilla behavior where a copy of a copy or tattered book cannot be copied further.