Method and system for sharing contents securely

A method for safely sharing contents and a system therefor are provided to safely share contents without leaking the contents to the outside which is not permitted. The first domain(140) having contents that needs security shares the contents with at least one of the second domains(160). If the second domains try to write the contents in an area where writing of the contents is not permitted, the writing of the contents is prevented. When the contents are shared, it is marked to indicate that the contents are stored in pages of a memory where the contents are shared. The first domain information is tagged. When the contents stored in the marked pages are loaded in registers, a tag having the first domain information is included in each register.