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Hi, do you notice that the "Title ID" TTLV description in PFS Programing guide(V4.3), if some streams has same "Title ID", it will be regard as a stream group, once you request a new persistent key for any content of this group, all the previous persistent keys of this group will be invalidate, so for avoiding this case, you need make sure your server response a CKC with different "Title ID" TTLV field value.