[ QUOTE ]
stockpile their own scripts
[/ QUOTE ]
If you're a WGA member, the union requires that you turn in all partials within 5 days of the start of the strike, regardless of who "owns" them. This is intended to assure members put in their 20 hours/week on the picket line and do not surreptitiously work on scripts. How it's enforceable is anyone's guess.
edit
it's part of the
"Script Validation Program." Note that it covers spec work for existing struck shows as well as anything produced on spec within the past 6 months.