Keyword Analysis & Research: why is the encrypt contents option grayed out

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
why is the encrypt contents option grayed out	0.11	0.1	5830	55	45
why	1.7	0.4	9125	65	3
is	0.86	0.6	8842	80	2
the	0.43	0.7	5194	1	3
encrypt	1.63	0.8	7898	45	7
contents	1.52	0.9	7814	68	8
option	0.88	0.1	2015	11	6
grayed	1.13	0.1	7015	70	6
out	0.21	0.1	8167	30	3

Keyword	CPC	PCC	Volume	Score
why is the encrypt contents option grayed out	1.47	0.2	2128	87