Source: The Betrayed Profession (1994), p. 11 Middle.
Indeed, even today we have significant areas of law where lawyers must pledge not to do what their clients would wish them to do. Judges will often agree to order the opponents of a party to a lawsuit to let that party's lawyers interrogate them and scour their files in unsupervised "discovery" proceedings prior to trial. Such access to the other party's secrets may, how- ever, be hedged with a "confidentiality agreement" by which the lawyer promises not to communicate the contents of those files to anyone, including his clients. House counsel for corporations will be limited in what they can do when litigation requires this sort of discovery [emboldening mine], because courts will be reluctant to give mere employees of the company, whether or not they have law degrees, access to confidential files of its rival.
Why does the bolded sentence refer only to house counsel? Doesn't this limitation include external counsel too?
What does 'they can do' mean exactly? No benefits from this unsupervised "discovery" to house counsel? House counsel's inability to thwart the counterparty's counsel from benefitting from this "discovery"?