A method for exporting permission is provided, it is used to solves the problem that the permission can not be exported multiple times among several DRM systems in the prior art; the method includes that: the first device exports the permission to the second device, said first device decides whether it is allowed that the permission could be exported to the system to which the second device belongs before exporting the permission; said first device further decides that whether it is allowed to export the export right of said permission before exporting the permission, and exports the export right of said permission to the second device if it is allowed, such that the second device can export said permission to another device. A terminal apparatus, a server and a communication network are also disclosed.<img id="iaf01" file="imgaf001.tif" wi="64" he="82" img-content="drawing" img-format="tif" />