There is no actual difference in IP safety level between grids who allow to save OAR (or even allow strangers to control sims) and grids with enabled HG. Both allows easy export of creations to SL or anywhere else where the thief wants to sell it...
Because of the internal sim/grid architecture there is only one safe way - either sims but also grids must be fully controlled by one trustful company.
To summarize - once you upload your stuff to a grid which allows it's export (via HG, OAR, IAR) you have to count with fact that it is technically full-perm for anyone who can get it it's copy and perform that export...