Good questions and good answers IMO.
If you think it through, why would any company ever buy back shares unless they thought (with their inside knowledge) that they would appreciate in value? That, plus as others have stated, the company has already stated their intent.
IMO (ignorant), with stated intent, they can buy to their heart's content WITHIN SEC GUIDELINES, which limit their buying (or selling) activity pretty severly (time constraints, volume constraints, etc.). And that, I presume, is why those guidelines exist.
Hope this helps, and hope someone with deeper insight chimes in....
'Cuz I KNOW nuttin'!
But I do really hope PTSC is buying to the limits.
SGE