What are the cast requirements for a co-production?

http://www.chinacoproduction.com 2008-06-11 China Film Co-Production Corporation

A:  With respect to joint productions, at least one third of the total main casts should be Chinese casts (i.e., from Mainland China), while the Chinese and foreign creative crew should in principle be of equal proportions; with respect to co-productions between Hong Kong film producers/companies and Mainlanders, the cast requirement must be observed but there is no requirement on the proportion of creative crew between the parties; there are no cast or crew restrictions with respect to assisted productions.

ÉÏһƪ£ºHow can I engage local crew to assist in the production?     ÏÂһƪ£ºIf I want to shoot a scene with a large number of temporary actors, do I need special permission?