  In this paper, we have analyzed the information paradox and its resolution
using island proposal in Schwarzschild de-Sitter black hole spacetime. First,
we study the information paradox for the black hole patch by treating de-Sitter
patch on both sides as a frozen background (by inserting thermal opaque
membrane) and then we carry out similar study for de-Sitter patch also. In both
cases, when there is no island surface then the entanglement entropy has as
usual the linear time dependence whereas in the presence of an island surface
entanglement entropy become constant (equal to twice of thermal entropy of
black hole/de-Sitter patch). Therefore, we obtain the Page curves for the black
hole and de-Sitter patch consistent with the unitary evolution of black holes.
In our case, we have found that black hole island is located inside the black
hole event horizon in contrast to universal result for eternal black holes and
also cosmological island is located inside the cosmological event horizon.
Further, we have studied the "effect of temperature" on the Page curves and
found that Page curves appear at later times for low temperature black
holes/de-Sitter patch and it exhibit opposite behavior for high temperature.
This implies that "dominance of islands" and "information recovery" takes more
time for low temperature black holes/de-Sitter patch in contrast to high
temperature black holes/de-Sitter patch. We also make comments on the
challenges to study the information paradox in SdS spacetime without the
thermal opaque membrane.
