a0d929ca_WSRP_v2_0_Specification__Statement_text
[#] CS148 [Section] 9.2.1.8 [Statement text] 
Note that the Consumer's aggregated page MUST be secure if any of the Portlets whose content is being displayed on the page have indicated the need for secure communication for their current markup.
WSRP v2.0 Specification
Statement text