I was doing some digging this afternoon into Dougie Hamilton and I found an interesting clause when it comes to signing players who are Restricted Free Agents:
Clubs must use their own draft picks (being those awarded directly to the Club by the League for use by it in the Entry Draft, including such draft picks described in the first clause of this parenthetical that a Club has traded or encumbered, and subsequently reacquired or unencumbered). Clubs cannot acquire picks to use as compensation (with the exception being a Club’s own draft selections that are traded and then re-acquired).